Discussion
On the weekend I was fiddling with my base idle screw on my 500 with catalyst. I thought the correct setting was fully down and then undo 1.5 turns, it took me 2.5 turns to get to the bottom. Once I undid it 1.5 turns the result is it idles a lot smoother and feels slightly smoother to drive. I didnt buy the car new, so was wondering, was it adjusted wrongly on it last service or has someone be tinkering before me. Would this over adjustment have done any bad things. Any thoughts boys and girls.
Edited by Saturn 5 on Thursday 2nd August 07:57
Some people wind the base idle up to compensate for muck around the throttle butterfly - the butterfly should be cleaned regularly.
Cheers,
Peter Humphries (and a green V8S)
quote:
On the weekend I was fiddling with my base idle screw on my 500 with catalyst. I thought the correct setting was fully down and then undo 1.5 turns, it took me 2.5 turns to get to the bottom. Once I undid it 1.5 turns the result is it idles a lot smoother and feels slightly smoother to drive. I didnt buy the car new, so was wondering, was it adjusted wrongly on it last service or has someone be tinkering before me. Would this over adjustment have done any bad things. Any thoughts boys and girls. Edited by Saturn 5 on Thursday 2nd August 07:57
quote:My 96 Grif500 was/still is sometimes suffering from a very erratic idle when hot,2 to 3K RPM and anywhere in between. Have checked and cleaned the stepper motor.Went to Team Central, they said the base idle was way off and adjusted. Still sometimes idle's quite poorly when hot.Do you reckon i should attempt to clean the butterfly area?, if so what's the best way to go about it?. Would appreciate any advice.
Its funny that you should say that Peter, I also cleaned out the buterfly area of crud. Do you strip yours down or do you do the best you can with everything in situ?
All I did was undo the air pipe from the plenum chamer and wiped the butterfly and surrounding area as best as I could with a cloth and a bit of white spirit. Then wiped it with a dry cloth. I didnt fancy a field strip.
See what Peter Humphreys says when he answers my question, as hes right on the ball about these things.
Hope that helps.
quote:] You can do it in situ, just disconnect the duct from the air flow meter. Be careful not to drop anything into the engine!
Do you strip yours down or do you do the best you can with everything in situ?
quote:Dirty Stepper is always the first suspect but you say you've cleaned that. Could be a sensor fault pushing the ECU into 'limp' mode - if you get a surge in power at about 3500 that would be my guess. I've also had flatspots and hesitation at low revs when hot, which I put down to fuel overheating in the fuel rail. It was worse when the tank was low, went away (for a while) when I filled up with nice fresh cold petrol. Lagging the fuel rails seems to have cured it. Idling problems could also be an incorrectly set up or faulty throttle pot fooling the ECU into thinking the throttle is slightly open. Or an air leak, or just about any problem in the fuel/ignition systems, which are bound to be worse when the engine gets really hot. Unfortunately the list of things to check is quite long ... Hope this helps, Peter Humphries (and a green V8S)
My 96 Grif500 was/still is sometimes suffering from a very erratic idle when hot,2 to 3K RPM and anywhere in between.
quote:] You can do it in situ, just disconnect the duct from the air flow meter. Be careful not to drop anything into the engine!
[quote]Do you strip yours down or do you do the best you can with everything in situ?
quote:Dirty Stepper is always the first suspect but you say you've cleaned that. Could be a sensor fault pushing the ECU into 'limp' mode - if you get a surge in power at about 3500 that would be my guess. I've also had flatspots and hesitation at low revs when hot, which I put down to fuel overheating in the fuel rail. It was worse when the tank was low, went away (for a while) when I filled up with nice fresh cold petrol. Lagging the fuel rails seems to have cured it. Idling problems could also be an incorrectly set up or faulty throttle pot fooling the ECU into thinking the throttle is slightly open. Or an air leak, or just about any problem in the fuel/ignition systems, which are bound to be worse when the engine gets really hot. Unfortunately the list of things to check is quite long ... Hope this helps, Peter Humphries (and a green V8S) Thanks, will investigate further.
My 96 Grif500 was/still is sometimes suffering from a very erratic idle when hot,2 to 3K RPM and anywhere in between.
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