Discussion
I have noticed that at low speed say below 30 mph my Monaro has a definite surge and seems hesitant. It then clears itself further up the rev range. When you slow down as in coming to a stop it starts to surge again. There are no fault codes showing,and the spark plugs and leads seem in order and they are not that old anyway.
I'm thinking 02 sensor's or maybe the tune is out!
Any ideas?
regards John
I'm thinking 02 sensor's or maybe the tune is out!
Any ideas?
regards John
What are you running?
For what it's worth, I think I've eliminated all surging on mine (dangerous to say that out loud) through a combination of accurate VE, and the ECT/IAT eq modifiers ringram recently turned me on to.
e: if you're running a cam people often advocate smoothing the spark table around the relevant area...I still haven't sorted my spark table though!
For what it's worth, I think I've eliminated all surging on mine (dangerous to say that out loud) through a combination of accurate VE, and the ECT/IAT eq modifiers ringram recently turned me on to.
e: if you're running a cam people often advocate smoothing the spark table around the relevant area...I still haven't sorted my spark table though!
Edited by KMud on Sunday 31st August 17:59
I forgot to mention my Monaro is a 5.7 VZ model. It has headers,sport cats, cat back ,cold air and a Wortec re-map.
As there is a problem I wonder if a code reader will help? even though the engine management light has not illuminated yet. Failing that how else can I check things out.
Thanks again John
As there is a problem I wonder if a code reader will help? even though the engine management light has not illuminated yet. Failing that how else can I check things out.
Thanks again John
before you do, i'd check whether your IAT is taken from the MAF or elsewhere
its a shame only chat about tyre brands goes on now as this was once a readily discussed issue but alas the mists of time I can't remember. I would say do a search but I hate it when people do that and the pistonheads search function is s
te
its a shame only chat about tyre brands goes on now as this was once a readily discussed issue but alas the mists of time I can't remember. I would say do a search but I hate it when people do that and the pistonheads search function is s
testigmundfreud said:
before you do, i'd check whether your IAT is taken from the MAF or elsewhere
Certainly on the LS2s the IAT is taken from the MAF. Presumably it's the same on the 5.7. EDIT: It's not the same, it's separate, ignore me!Edited by SturdyHSV on Monday 1st September 09:56
I think I've fixed it!!!
I removed all the pipe work from the throttle body to the VCM air filter housing. I then cleaned everything up, except the MAF which was very clean inside anyway.
All was put back together and given a test drive with the MAF disconnected. The car ran fine with no apparent issues. I reconnected the MAF and went for a second test drive, again the car was fine with no surging.
So hopefully it was probably an air leak.Time will tell.
Thanks to Roger from MF for the tip.
Regards John
I removed all the pipe work from the throttle body to the VCM air filter housing. I then cleaned everything up, except the MAF which was very clean inside anyway.
All was put back together and given a test drive with the MAF disconnected. The car ran fine with no apparent issues. I reconnected the MAF and went for a second test drive, again the car was fine with no surging.
So hopefully it was probably an air leak.Time will tell.
Thanks to Roger from MF for the tip.
Regards John
Yes my car has started to surge again, very slight but still there.
It seems to come in at around 1500rpm. I have also noticed when I stop at a junction the engine continues to hold the revs for a second or two before it settles down.
would a diagnostic tune show up any faults? still no fault codes shown as yet.
Regards john
It seems to come in at around 1500rpm. I have also noticed when I stop at a junction the engine continues to hold the revs for a second or two before it settles down.
would a diagnostic tune show up any faults? still no fault codes shown as yet.
Regards john
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