Volvo C70 - Intermittant/lack of boost before 5k rpm
Discussion
Hi guys,
I just wanted to get some advice to see if this might be fixable for me to do before calling in the proper people.
I bought a C70 2.4T Cab in Jan of this year as my commuter, great car, love Volvo's however it has a niggling problem.
The engine check light is on and from cold it feels like it does have some go but certainly nothing as seems to be described by others with a T5 2.4 C70. It does get a bit of a surge from 5000rpm but once upto temperature it just feels like there's no boost at all. I also get a bit of an eggy smell sometimes.
The cars idle is steady at 900rpm, it's never stalled and on the whole drives fine, it just doesn't have any shove to it which I know it should.
I've been reading posts about boost leaks, J pipes, Lambda sensors and MAF's etc.
Could this be MAF related and is it worth giving it a clean??
The only other mechanical point that I need to investigate some form of rattle from underneath on uneven surfaces, I'll investigate to see if it's just a bracket or could that be the noise of a "goosed" Cat convertor due to it running lean for too long?
All help and advice greatly appreciated, I've ordered an OBD2 scanner so I can have a look at it and see what code it throws up.
I just wanted to get some advice to see if this might be fixable for me to do before calling in the proper people.
I bought a C70 2.4T Cab in Jan of this year as my commuter, great car, love Volvo's however it has a niggling problem.
The engine check light is on and from cold it feels like it does have some go but certainly nothing as seems to be described by others with a T5 2.4 C70. It does get a bit of a surge from 5000rpm but once upto temperature it just feels like there's no boost at all. I also get a bit of an eggy smell sometimes.
The cars idle is steady at 900rpm, it's never stalled and on the whole drives fine, it just doesn't have any shove to it which I know it should.
I've been reading posts about boost leaks, J pipes, Lambda sensors and MAF's etc.
Could this be MAF related and is it worth giving it a clean??
The only other mechanical point that I need to investigate some form of rattle from underneath on uneven surfaces, I'll investigate to see if it's just a bracket or could that be the noise of a "goosed" Cat convertor due to it running lean for too long?
All help and advice greatly appreciated, I've ordered an OBD2 scanner so I can have a look at it and see what code it throws up.
Evo said:
Hi guys,
I just wanted to get some advice to see if this might be fixable for me to do before calling in the proper people.
I bought a C70 2.4T Cab in Jan of this year as my commuter, great car, love Volvo's however it has a niggling problem.
The engine check light is on and from cold it feels like it does have some go but certainly nothing as seems to be described by others with a T5 2.4 C70. It does get a bit of a surge from 5000rpm but once upto temperature it just feels like there's no boost at all. I also get a bit of an eggy smell sometimes.
The cars idle is steady at 900rpm, it's never stalled and on the whole drives fine, it just doesn't have any shove to it which I know it should.
I've been reading posts about boost leaks, J pipes, Lambda sensors and MAF's etc.
Could this be MAF related and is it worth giving it a clean??
The only other mechanical point that I need to investigate some form of rattle from underneath on uneven surfaces, I'll investigate to see if it's just a bracket or could that be the noise of a "goosed" Cat convertor due to it running lean for too long?
All help and advice greatly appreciated, I've ordered an OBD2 scanner so I can have a look at it and see what code it throws up.
Ok, let's clarify a few things...I just wanted to get some advice to see if this might be fixable for me to do before calling in the proper people.
I bought a C70 2.4T Cab in Jan of this year as my commuter, great car, love Volvo's however it has a niggling problem.
The engine check light is on and from cold it feels like it does have some go but certainly nothing as seems to be described by others with a T5 2.4 C70. It does get a bit of a surge from 5000rpm but once upto temperature it just feels like there's no boost at all. I also get a bit of an eggy smell sometimes.
The cars idle is steady at 900rpm, it's never stalled and on the whole drives fine, it just doesn't have any shove to it which I know it should.
I've been reading posts about boost leaks, J pipes, Lambda sensors and MAF's etc.
Could this be MAF related and is it worth giving it a clean??
The only other mechanical point that I need to investigate some form of rattle from underneath on uneven surfaces, I'll investigate to see if it's just a bracket or could that be the noise of a "goosed" Cat convertor due to it running lean for too long?
All help and advice greatly appreciated, I've ordered an OBD2 scanner so I can have a look at it and see what code it throws up.
There was never a 2.4 T5 C70.
The 2.4 T5 engine was first used in the facelift P2 cars from 2005 (and in the P1 phase 3 V70R but that's a different story).
If yours is a 2.4, it won't be a T5 nor will it be anywhere near as fast as a T5 so don't expect it to tear your face off, weather it's working or not.
If you need to confirm weather or not it's a T5, look on the timing belt cover, down the side, facing the inner wing. A T5 will have B5234T3 on a white sticker. Only the T5 had this engine code.
On to your problem...
TCV? possible but unlikely, you could bypass it with a cheap manual boost controller from ebay and see if it makes a difference, or even try a known working Volvo TCV to see if it sorts it. I gave my spare away a while ago, otherwise I'd me more than happy to let you have it for a while.
Stuck wastegate? possibly - it happened on mine and made it play up but didn't trigger any warning lights so I doubt it's the problem. You can easily check the wastegate by looking over the back of the engine, you'll see the wastegate actuator arm on top of the turbo, pull it hard towards the drivers side of the car - it should put up a bit of a fight but move freely, and snap back.
I personally (from your eggy smell comment) think your cat has collapsed or you possibly have a ETM (Electronic Throttle Module) fault. The ETMs on these aren't known for their reliability. Removing and cleaning the throttle module can help a great deal so weather or not it'll fix your particular problem, it'll be well worth taking it off and giving it a good clean. If the car is pre-1998, and has a throttle cable instead of the electronic throttle, then I would start looking for failed coil, distributor, leads and ICV.
Hope this helps.
Edited by martinrpeachey on Wednesday 25th June 09:56
martinrpeachey said:
Evo said:
Hi guys,
I just wanted to get some advice to see if this might be fixable for me to do before calling in the proper people.
I bought a C70 2.4T Cab in Jan of this year as my commuter, great car, love Volvo's however it has a niggling problem.
The engine check light is on and from cold it feels like it does have some go but certainly nothing as seems to be described by others with a T5 2.4 C70. It does get a bit of a surge from 5000rpm but once upto temperature it just feels like there's no boost at all. I also get a bit of an eggy smell sometimes.
The cars idle is steady at 900rpm, it's never stalled and on the whole drives fine, it just doesn't have any shove to it which I know it should.
I've been reading posts about boost leaks, J pipes, Lambda sensors and MAF's etc.
Could this be MAF related and is it worth giving it a clean??
The only other mechanical point that I need to investigate some form of rattle from underneath on uneven surfaces, I'll investigate to see if it's just a bracket or could that be the noise of a "goosed" Cat convertor due to it running lean for too long?
All help and advice greatly appreciated, I've ordered an OBD2 scanner so I can have a look at it and see what code it throws up.
Ok, let's clarify a few things...I just wanted to get some advice to see if this might be fixable for me to do before calling in the proper people.
I bought a C70 2.4T Cab in Jan of this year as my commuter, great car, love Volvo's however it has a niggling problem.
The engine check light is on and from cold it feels like it does have some go but certainly nothing as seems to be described by others with a T5 2.4 C70. It does get a bit of a surge from 5000rpm but once upto temperature it just feels like there's no boost at all. I also get a bit of an eggy smell sometimes.
The cars idle is steady at 900rpm, it's never stalled and on the whole drives fine, it just doesn't have any shove to it which I know it should.
I've been reading posts about boost leaks, J pipes, Lambda sensors and MAF's etc.
Could this be MAF related and is it worth giving it a clean??
The only other mechanical point that I need to investigate some form of rattle from underneath on uneven surfaces, I'll investigate to see if it's just a bracket or could that be the noise of a "goosed" Cat convertor due to it running lean for too long?
All help and advice greatly appreciated, I've ordered an OBD2 scanner so I can have a look at it and see what code it throws up.
There was never a 2.4 T5 C70.
The 2.4 T5 engine was first used in the facelift P2 cars from 2005 (and in the P1 phase 3 V70R but that's a different story).
If yours is a 2.4, it won't be a T5 nor will it be anywhere near as fast as a T5 so don't expect it to tear your face off, weather it's working or not.
If you need to confirm weather or not it's a T5, look on the timing belt cover, down the side, facing the inner wing. A T5 will have B5234T3 on a white sticker. Only the T5 had this engine code.
On to your problem...
TCV? possible but unlikely, you could bypass it with a cheap manual boost controller from ebay and see if it makes a difference, or even try a known working Volvo TCV to see if it sorts it. I gave my spare away a while ago, otherwise I'd me more than happy to let you have it for a while.
Stuck wastegate? possibly - it happened on mine and made it play up but didn't trigger any warning lights so I doubt it's the problem. You can easily check the wastegate by looking over the back of the engine, you'll see the wastegate actuator arm on top of the turbo, pull it hard towards the drivers side of the car - it should put up a bit of a fight but move freely, and snap back.
I personally (from your eggy smell comment) think your cat has collapsed or you possibly have a ETM (Electronic Throttle Module) fault. The ETMs on these aren't known for their reliability. Removing and cleaning the throttle module can help a great deal so weather or not it'll fix your particular problem, it'll be well worth taking it off and giving it a good clean. If the car is pre-1998, and has a throttle cable instead of the electronic throttle, then I would start looking for failed coil, distributor, leads and ICV.
Hope this helps.
Edited by martinrpeachey on Wednesday 25th June 09:56
The car is a 2002 so I'll have to check but would assume based on info it would have had the white sticker ETM, yellow were post 2003?
I thought ETM problems would have manifested in an erratic idle, hunting, intermittent throttle but my car drives perfectly, no problems at all.
Can a collapsed cat cause the engine check light to come on?
My scanner hopefully arrives on Friday so hopefully that will shed so light on what codes are there. I'll read the codes first then clear it and see what comes back.
You may be right on the cat as the car does have a metallic rattle going over bumps, almost sounds like a rattling linkage
Cheers,
Jeremy.
Evo said:
Thank-you for the reply, I wasn't confusing it with the 2.3 "full fat" T5 just that the 2.0, 2.3 and 2.4 are all 5 cylinder engines, I thought they were referred to as T5 engines, just not the one with 240bhp. It won't help that I've come from a TVR as my commuter car
The car is a 2002 so I'll have to check but would assume based on info it would have had the white sticker ETM, yellow were post 2003?
I thought ETM problems would have manifested in an erratic idle, hunting, intermittent throttle but my car drives perfectly, no problems at all.
Can a collapsed cat cause the engine check light to come on?
My scanner hopefully arrives on Friday so hopefully that will shed so light on what codes are there. I'll read the codes first then clear it and see what comes back.
You may be right on the cat as the car does have a metallic rattle going over bumps, almost sounds like a rattling linkage
Cheers,
Jeremy.
Only a T5 is a T5 The car is a 2002 so I'll have to check but would assume based on info it would have had the white sticker ETM, yellow were post 2003?
I thought ETM problems would have manifested in an erratic idle, hunting, intermittent throttle but my car drives perfectly, no problems at all.
Can a collapsed cat cause the engine check light to come on?
My scanner hopefully arrives on Friday so hopefully that will shed so light on what codes are there. I'll read the codes first then clear it and see what comes back.
You may be right on the cat as the car does have a metallic rattle going over bumps, almost sounds like a rattling linkage
Cheers,
Jeremy.
You should have a go in a modified T5, I can say from personal experience, they're a lot of fun (mine's over 280bhp)The cat would be a good guess. Make sure you post the codes you pull from the car on here as a generic reader will not always tell you what the problem is and often mislead people. what can show on a reader as "throttle pedal sensor" is in fact a dirty maf and so - on.
If you're anywhere near the south coast I'd be happy to have a look at the car for you.
Another possibility (just came to mind) is the boost pressure sensor, I've seen a lot of these fail recently and they can play havoc with the engine management.
Edited by martinrpeachey on Wednesday 25th June 11:11
martinrpeachey said:
Evo said:
Thank-you for the reply, I wasn't confusing it with the 2.3 "full fat" T5 just that the 2.0, 2.3 and 2.4 are all 5 cylinder engines, I thought they were referred to as T5 engines, just not the one with 240bhp. It won't help that I've come from a TVR as my commuter car
The car is a 2002 so I'll have to check but would assume based on info it would have had the white sticker ETM, yellow were post 2003?
I thought ETM problems would have manifested in an erratic idle, hunting, intermittent throttle but my car drives perfectly, no problems at all.
Can a collapsed cat cause the engine check light to come on?
My scanner hopefully arrives on Friday so hopefully that will shed so light on what codes are there. I'll read the codes first then clear it and see what comes back.
You may be right on the cat as the car does have a metallic rattle going over bumps, almost sounds like a rattling linkage
Cheers,
Jeremy.
Only a T5 is a T5 The car is a 2002 so I'll have to check but would assume based on info it would have had the white sticker ETM, yellow were post 2003?
I thought ETM problems would have manifested in an erratic idle, hunting, intermittent throttle but my car drives perfectly, no problems at all.
Can a collapsed cat cause the engine check light to come on?
My scanner hopefully arrives on Friday so hopefully that will shed so light on what codes are there. I'll read the codes first then clear it and see what comes back.
You may be right on the cat as the car does have a metallic rattle going over bumps, almost sounds like a rattling linkage
Cheers,
Jeremy.
You should have a go in a modified T5, I can say from personal experience, they're a lot of fun (mine's over 280bhp)The cat would be a good guess. Make sure you post the codes you pull from the car on here as a generic reader will not always tell you what the problem is and often mislead people. what can show on a reader as "throttle pedal sensor" is in fact a dirty maf and so - on.
If you're anywhere near the south coast I'd be happy to have a look at the car for you.
Another possibility (just came to mind) is the boost pressure sensor, I've seen a lot of these fail recently and they can play havoc with the engine management.
Edited by martinrpeachey on Wednesday 25th June 11:11
I rather liked it when I had Beta Twincams with carbs, I could fix those.
Evo said:
I would imagine a T5 with just shy of 300bhp would be very impressive indeed
I rather liked it when I had Beta Twincams with carbs, I could fix those.
Yup - that's the problem with the modern stuff - anything goes wrong and the computer kicks off but won't tell you what's up without plugging the damn thing in.I rather liked it when I had Beta Twincams with carbs, I could fix those.
I can't even swap my window switchpack without it going nuts.
Mind, when they work properly, they're brilliant.
If its running ok from cold but gets worse when hot I'd be checking the basics first, namely the coil packs. Throttle body problems will always create an open circuit and bring on the "ETS" light so thats probably fine. Secondly I'd be checking for a faulty injector as once again, these tend to play up and cause a misfire (namely an eggy smell) when up to temperature.
morgrp said:
If its running ok from cold but gets worse when hot I'd be checking the basics first, namely the coil packs. Throttle body problems will always create an open circuit and bring on the "ETS" light so thats probably fine. Secondly I'd be checking for a faulty injector as once again, these tend to play up and cause a misfire (namely an eggy smell) when up to temperature.
To be honest it's doesn't misfire or run badly at all (apart from this occasional boost surge at 5k revs) I bought and plugged in a diagnostic machine and pulled the following two codes,
P0030 Volvo - HO2S Heater Control Circuit Bank 1 Sensor 1
P0806 -- ECM-9100 -- Clutch pedal sensor -- Faulty signal
Cleared the codes and fuel economy improves until the light comes back on after a few miles.
Cheers.
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