hi
I have a 95 GTS 5.0
For almost five years I'm chasing my bad idle demon. Only at idle the engine is misfiring. from 1500 rpm and up there is no misfiring. Everytime when I stomp on the gas pedal after cruising I get a backfire. furthermore my quarterhorse shows that my fuel error is off by about 20%! (ecm pulling fuel because of misfire). The injectors are dialed in fine. only when I'm accelerating and decelerating the fuel error gets extremely off.
I already checked jrichkers idle surging list, no change
I checked every sensor, every Ignition component, cable, changed ECM etc.
no vaccuum leaks. engine pulls 20 in hg!
I even did check every electrical cable for voltage. yes! some cables were corroded, but I replaced them. Of course I replaced every ground cable with thicker ones.
And I did a engine rebuild one year ago. But: I didnt replace the lifters.
Could they be the culprits? I know bad lifters could cause bad compression and therefore misfiring issues.
So. before I remove the lower intake again and replace the lifters, is there a possibility to check the lifters if they work perfect?
I did also the pour-a-half-quart-atf-in-your-engine-oil-dude-method. I drove for about 100 miles. new oil and filter. no change.
any ideas? questions?
*EDIT*
Yes, I have strange lifter noises
I have a 95 GTS 5.0
For almost five years I'm chasing my bad idle demon. Only at idle the engine is misfiring. from 1500 rpm and up there is no misfiring. Everytime when I stomp on the gas pedal after cruising I get a backfire. furthermore my quarterhorse shows that my fuel error is off by about 20%! (ecm pulling fuel because of misfire). The injectors are dialed in fine. only when I'm accelerating and decelerating the fuel error gets extremely off.
I already checked jrichkers idle surging list, no change
I checked every sensor, every Ignition component, cable, changed ECM etc.
no vaccuum leaks. engine pulls 20 in hg!
I even did check every electrical cable for voltage. yes! some cables were corroded, but I replaced them. Of course I replaced every ground cable with thicker ones.
And I did a engine rebuild one year ago. But: I didnt replace the lifters.
Could they be the culprits? I know bad lifters could cause bad compression and therefore misfiring issues.
So. before I remove the lower intake again and replace the lifters, is there a possibility to check the lifters if they work perfect?
I did also the pour-a-half-quart-atf-in-your-engine-oil-dude-method. I drove for about 100 miles. new oil and filter. no change.
any ideas? questions?
*EDIT*
Yes, I have strange lifter noises