Calling all Diagnostics experts...
Discussion
Recently had a lot of work done on the tuscan along with the mot and 6000 mile service including 2 new lambda sensors, new plugs, one new throttle pot, timing chain adjustment, adjustment of throttle bodies. most of which was done to get the emissions to a more acceptable level for MOT. Shortly afterwards it was decatted.
200 miles later (on a pretty hot and heavy london traffic run) i got an intermittent EFI fault and some blue smoke on the overrun, only noticable when stopping at traffic lights after a bit of a lead foot moment...
so before i take it back to the guys who did the service and other work, i'd love to hear your opinions on the diagnostics below.
check out the adaptives - way out of normal range? i've highlighted the EFI fault period on the real time data readouts as well.
the first few images are when cold - just started.
air fuel ratio BAD...
translucent white box represents EFI Fault on dash.
and when hot after the run...
i love this diagnostics stuff but am very new to it. It seems to me as though the Lambda 2 readout runs concurrently with the EFI Fault? seems strange as theyve both been replaced recently?
any advice appreciated as always!
200 miles later (on a pretty hot and heavy london traffic run) i got an intermittent EFI fault and some blue smoke on the overrun, only noticable when stopping at traffic lights after a bit of a lead foot moment...
so before i take it back to the guys who did the service and other work, i'd love to hear your opinions on the diagnostics below.
check out the adaptives - way out of normal range? i've highlighted the EFI fault period on the real time data readouts as well.
the first few images are when cold - just started.
air fuel ratio BAD...
translucent white box represents EFI Fault on dash.
and when hot after the run...
i love this diagnostics stuff but am very new to it. It seems to me as though the Lambda 2 readout runs concurrently with the EFI Fault? seems strange as theyve both been replaced recently?
any advice appreciated as always!
at first glance looks like a lambda fault, but can you put up the adaptives maps. You can get to them under the logs I think. Then reset the adaptives, the throttle position , the fault logs and drive it. Any other symptoms?
What was the oil fill height, if it has been topped to the max and you have been giving it some beans then it might be just burning off the airbox residue.
I run with a decat chip and the adaptives are spot on, but I have noticed a healthy appetite for ignition leads, my no 6 had gone through the insulation, and no 1 had evidence of water.
What was the oil fill height, if it has been topped to the max and you have been giving it some beans then it might be just burning off the airbox residue.
I run with a decat chip and the adaptives are spot on, but I have noticed a healthy appetite for ignition leads, my no 6 had gone through the insulation, and no 1 had evidence of water.
Solid advice. Thanks guys.
I'll get the adaptives posted as soon as I get home on Wednesday. Out of town for a few days at the moment.
Will check oil fill level. Hope it's that simple!
In terms of clearing logs and adaptives, is there anything that can go wrong doing this??
Will also check lambda type and wiring and report back in a few days.
Cheers all.
I'll get the adaptives posted as soon as I get home on Wednesday. Out of town for a few days at the moment.
Will check oil fill level. Hope it's that simple!
In terms of clearing logs and adaptives, is there anything that can go wrong doing this??
Will also check lambda type and wiring and report back in a few days.
Cheers all.
I had the same with mine recently. Pot 6 was not balanced correctly in relation to the other 5. They work in banks of three. The lambda fault & AFR faults for pots 4-6 was because the lambda sensor went over range (+1.74v) and the AFR fault was because the adaptive map for that bank went out of range trying to compensate for the incorrect fueling due to pot 6 being way out.
I would check the Lambda sensors are (a) the correct items (b) functioning correctly). The S6 engine came with two or three varients of the lambda sensor (3 & 4 wire types I think)
I would also check the throttle ballance is correct with a syncrometer over all 6 pots. They should read about 6.0kh/hr air flow at idle (900 rpm)
The adaptive settings appear to be all over the place with some big numbers indicating rich and lean running (they should remain similar and close to zero +/- 10% ish.
Air temp is because you unpluged the sensor on the air box? Battery fault log I suggest is nothing, I can simulate this by simply unplugging the heater amp!
If in doubt get it checked by an expert, there is a manual for using wit the S6 engine software. I have a copy but can't remember where I downloaded it from, there is lots of good stuff in there with an explanation of all the various elements of the software.
TBH if it were my car and I had only done 200 miles since it had been fettled I would be back their asking them to sort it out. If they are a good TVR indie they will have it sorted quick with no fuss. Don't know who you took the car to but I remember they provided quite a comprehensive list of work your car needed + its service & MOT.
Shep
I would check the Lambda sensors are (a) the correct items (b) functioning correctly). The S6 engine came with two or three varients of the lambda sensor (3 & 4 wire types I think)
I would also check the throttle ballance is correct with a syncrometer over all 6 pots. They should read about 6.0kh/hr air flow at idle (900 rpm)
The adaptive settings appear to be all over the place with some big numbers indicating rich and lean running (they should remain similar and close to zero +/- 10% ish.
Air temp is because you unpluged the sensor on the air box? Battery fault log I suggest is nothing, I can simulate this by simply unplugging the heater amp!
If in doubt get it checked by an expert, there is a manual for using wit the S6 engine software. I have a copy but can't remember where I downloaded it from, there is lots of good stuff in there with an explanation of all the various elements of the software.
TBH if it were my car and I had only done 200 miles since it had been fettled I would be back their asking them to sort it out. If they are a good TVR indie they will have it sorted quick with no fuss. Don't know who you took the car to but I remember they provided quite a comprehensive list of work your car needed + its service & MOT.
Shep
Edited by shep1001 on Monday 8th August 22:16
Allandwf said:
Yep, the diagnostics manual is on this site for those that want it.Shep
dlewis said:
Call me old fashioned but running 102 degrees and both fans on with outside air temp of 38degrees!
yes i was a bit alarmed by that! the pod reading was about 93 so i didnt think anything of leaving it idling while i ran the software at the end of the run. it's going in on thursday so thats another thing on the checklist for them to investigate. why do i get the feeling a big money pit is about to open up and swallow me whole...
Quick update...
I took the car to Str8six to get the pros to take a look and my god, i wish i had done this in the first place.
The previous garage spent thousands of pounds of my hard earned cash trying to get it through the MOT (which now i understand may or may not have needed doing). Their recommendation was a reconditioned ECU to overcome the final AFR issue.
Str8six had the car for a couple of weeks and found that the ECU was absolutely fine and it was the throttle bodies that needed refurbishing. So we went ahead with this work. The car has never driven better and everything's rosey once again.
So a big thanks to Jason and Chas for sorting it all out. Highly recommended. A lesson learnt that even though a garage has 5 TVR's parked outside, they dont necessarily know what they're doing.
No hard feelings, but if any of you PH'ers are looking for a garage that knows what it's doing, Str8six is excellent.
and just when i get the car running great, it goes away for the winter... boo. cant wait for the summer
I took the car to Str8six to get the pros to take a look and my god, i wish i had done this in the first place.
The previous garage spent thousands of pounds of my hard earned cash trying to get it through the MOT (which now i understand may or may not have needed doing). Their recommendation was a reconditioned ECU to overcome the final AFR issue.
Str8six had the car for a couple of weeks and found that the ECU was absolutely fine and it was the throttle bodies that needed refurbishing. So we went ahead with this work. The car has never driven better and everything's rosey once again.
So a big thanks to Jason and Chas for sorting it all out. Highly recommended. A lesson learnt that even though a garage has 5 TVR's parked outside, they dont necessarily know what they're doing.
No hard feelings, but if any of you PH'ers are looking for a garage that knows what it's doing, Str8six is excellent.
and just when i get the car running great, it goes away for the winter... boo. cant wait for the summer
TuscanHunty said:
Quick update...
I took the car to Str8six to get the pros to take a look and my god, i wish i had done this in the first place.
The previous garage spent thousands of pounds of my hard earned cash trying to get it through the MOT (which now i understand may or may not have needed doing). Their recommendation was a reconditioned ECU to overcome the final AFR issue.
Str8six had the car for a couple of weeks and found that the ECU was absolutely fine and it was the throttle bodies that needed refurbishing. So we went ahead with this work. The car has never driven better and everything's rosey once again.
So a big thanks to Jason and Chas for sorting it all out. Highly recommended. A lesson learnt that even though a garage has 5 TVR's parked outside, they dont necessarily know what they're doing.
No hard feelings, but if any of you PH'ers are looking for a garage that knows what it's doing, Str8six is excellent.
and just when i get the car running great, it goes away for the winter... boo. cant wait for the summer
Ah-ha! Mine is with Jason & Co. at the moment. MOT plus short service ...and to address throttle body 'issues' (air leakage at head flange and/or spindle/bearing wear - plus diff pinion oil seal replacement). Hope I'm happy too!I took the car to Str8six to get the pros to take a look and my god, i wish i had done this in the first place.
The previous garage spent thousands of pounds of my hard earned cash trying to get it through the MOT (which now i understand may or may not have needed doing). Their recommendation was a reconditioned ECU to overcome the final AFR issue.
Str8six had the car for a couple of weeks and found that the ECU was absolutely fine and it was the throttle bodies that needed refurbishing. So we went ahead with this work. The car has never driven better and everything's rosey once again.
So a big thanks to Jason and Chas for sorting it all out. Highly recommended. A lesson learnt that even though a garage has 5 TVR's parked outside, they dont necessarily know what they're doing.
No hard feelings, but if any of you PH'ers are looking for a garage that knows what it's doing, Str8six is excellent.
and just when i get the car running great, it goes away for the winter... boo. cant wait for the summer
Nick
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