stumbling turbo
Discussion
my 89 mpfi gm nonchargcooled car is having problems accelerating hard.. not pulling boost, i put my foot into into the throttle and it bogs and stumbles when the turbo comes on,other than that it works spot on ,it seems very good today after changing all vacuam lines and wastegate hoses but,even after i did that i drove it for about 100 miles and it was still stumbling all over itself,then suddenly it cleared up,it's pulling hard on spool again and running very well,no check eng light or anything,i have a shop manual but just can't figure out if its the wastegate or pressure senor or what,by the way i have checked timing and reset ecm
Hi,
I've had EXACTLY the same problem with my SE for the last few weeks. Did searches on this forum and Was thinking of the turbo/ actuator/ vaccum hoses as the cause (plugs were fine). Followed the advice on this post that although a year old,had no final result...
Senna?
Thought i'd post what caused it for me:
Was simply a broken HT lead on No4. Split inside the rubber sparkplug boot,so impossible to see. Have routed the new leads to avoid the stress that caused this to happen.
Car is now Stumble free
Cheapest first then,always.
>> Edited by paul c on Monday 23 August 23:43
I've had EXACTLY the same problem with my SE for the last few weeks. Did searches on this forum and Was thinking of the turbo/ actuator/ vaccum hoses as the cause (plugs were fine). Followed the advice on this post that although a year old,had no final result...
Senna?
Thought i'd post what caused it for me:
Was simply a broken HT lead on No4. Split inside the rubber sparkplug boot,so impossible to see. Have routed the new leads to avoid the stress that caused this to happen.
Car is now Stumble free
Cheapest first then,always.
>> Edited by paul c on Monday 23 August 23:43
Hi,
PaulC makes a great point. These are very complex cars and so the list of possibilities will often be long as well.
But, the basics of problem solving still apply, eliminate the obvious first and then search for more complex causes. With virtually any running issues, always follow the mantra: Fuel, Air, Spark!
Start by eliminating the simple causes and you'll usually find it, if not, at least you'll know what it isn't and be further toward a resolve.
Happy Motoring! ...Jim'85TE
PaulC makes a great point. These are very complex cars and so the list of possibilities will often be long as well.
But, the basics of problem solving still apply, eliminate the obvious first and then search for more complex causes. With virtually any running issues, always follow the mantra: Fuel, Air, Spark!
Start by eliminating the simple causes and you'll usually find it, if not, at least you'll know what it isn't and be further toward a resolve.
Happy Motoring! ...Jim'85TE
I had the same problem in my 1991 SE after installing an oil catch tank. I disconnected the throttle position sensor as part of the work and must have gotten some oil on it (my hands looked like I had been doing an oil change not air box work) before reconnecting it. I used electrical contact cleaner on the plug and sensor and it got rid of the sputter.
**Correction: The problem actually was that the little black tube that runs from the Manifold Air Pressure Sensor to the manifold got pulled out at the manifold**
>> Edited by dknighto on Thursday 26th August 15:46
**Correction: The problem actually was that the little black tube that runs from the Manifold Air Pressure Sensor to the manifold got pulled out at the manifold**
>> Edited by dknighto on Thursday 26th August 15:46
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