OK so heres the story...
Car was running fine, no issues for awhile. One day im driving and i noticed between shifts it would flash a CEL and than it would go away...this eventually progressed to the point where at around 2500-3000 rpm if i was cruising..CEL would come on for a split second, engine would die, and than catch itself. Sometimes it will happen at lower RPM while switching gears. Some days is better than others, might not happen at all...might happen a bunch of times.
So after some checking, i noticed my crank sensor (which was new) wasnt in spec in terms of Ohm reading..so i replaced it. Same problem.
So than i just went on a spree and replaced anything that might have been it, some things (relays) i feel i should have replaced anyways due to them being as old as the car.
So heres what was replaced
-Crank sensor (also is withing proper distance from teeth on harmonic)
-Main and fuel relays
-AFM (used but resistance track looks fine, hasnt worn through)
-DME
-TPS
-Cleaned all grounds
-Temp sensor checks out good
There are no vac leaks.
The ignition system is only a few months old, oxygen sensor is also new
Heres what i noticed when this happens, i can ususally get it to happen in any gear but its easier to get it to happen in 5th when just driving along, its not very fun when it happens in 1st and your head goes straight for the wheel! Generally between 2500-3000 rpm.
One thing i noticed, when this happens the CEL come on and the tach drops down to 0 rpm (never quite gets there as the car catches itself before than) so im fairly certain this is not a fuel related issue as the tach would just move down as if i let off the gas, not shoot down as if it was unplugged.
At first i thought AFM, but this happens with BOTH of the AFM's i have...its possible there both worn out, but in the exact same spot? Also if it was the AFM wouldnt the tach still be reading correctly? I will try bending the tabs in the new one to have it cross a few part of the resistance bar but im not so sure its the issue.
Also i can only get this to happen while moving, engine idles absolutely PERFECT and i can rev it all day long passing 2500-3k and it will be fine.
I was also thinking that the harmonic might be bad and slipping causing the CPS so get messed up readings...but i feel it wouldnt be so RPM specific.
So im back to square one...maybe a bad AFM, maybe not.
Could also be wiring, but again..RPM specific, and makes no difference weather i hit a bump or not car could be on a smooth as glass surface and still cut out.
Im going to bend the contacts on the AFM tomorrow so it passes over a new spot on the bar, if the problem still persists...im out of ideas
The fact is, because the tach drops down my thoughts are either
CPS
DME
Slipping harmonic
Main relay
But CPS is good, checked out within spec
DME has been replaced, same issue occours
Slipping harmonic i feel wouldnt be so RPM specific and would happen even if i was revving it in neutral
Main relay has been replaced
Car was running fine, no issues for awhile. One day im driving and i noticed between shifts it would flash a CEL and than it would go away...this eventually progressed to the point where at around 2500-3000 rpm if i was cruising..CEL would come on for a split second, engine would die, and than catch itself. Sometimes it will happen at lower RPM while switching gears. Some days is better than others, might not happen at all...might happen a bunch of times.
So after some checking, i noticed my crank sensor (which was new) wasnt in spec in terms of Ohm reading..so i replaced it. Same problem.
So than i just went on a spree and replaced anything that might have been it, some things (relays) i feel i should have replaced anyways due to them being as old as the car.
So heres what was replaced
-Crank sensor (also is withing proper distance from teeth on harmonic)
-Main and fuel relays
-AFM (used but resistance track looks fine, hasnt worn through)
-DME
-TPS
-Cleaned all grounds
-Temp sensor checks out good
There are no vac leaks.
The ignition system is only a few months old, oxygen sensor is also new
Heres what i noticed when this happens, i can ususally get it to happen in any gear but its easier to get it to happen in 5th when just driving along, its not very fun when it happens in 1st and your head goes straight for the wheel! Generally between 2500-3000 rpm.
One thing i noticed, when this happens the CEL come on and the tach drops down to 0 rpm (never quite gets there as the car catches itself before than) so im fairly certain this is not a fuel related issue as the tach would just move down as if i let off the gas, not shoot down as if it was unplugged.
At first i thought AFM, but this happens with BOTH of the AFM's i have...its possible there both worn out, but in the exact same spot? Also if it was the AFM wouldnt the tach still be reading correctly? I will try bending the tabs in the new one to have it cross a few part of the resistance bar but im not so sure its the issue.
Also i can only get this to happen while moving, engine idles absolutely PERFECT and i can rev it all day long passing 2500-3k and it will be fine.
I was also thinking that the harmonic might be bad and slipping causing the CPS so get messed up readings...but i feel it wouldnt be so RPM specific.
So im back to square one...maybe a bad AFM, maybe not.
Could also be wiring, but again..RPM specific, and makes no difference weather i hit a bump or not car could be on a smooth as glass surface and still cut out.
Im going to bend the contacts on the AFM tomorrow so it passes over a new spot on the bar, if the problem still persists...im out of ideas
The fact is, because the tach drops down my thoughts are either
CPS
DME
Slipping harmonic
Main relay
But CPS is good, checked out within spec
DME has been replaced, same issue occours
Slipping harmonic i feel wouldnt be so RPM specific and would happen even if i was revving it in neutral
Main relay has been replaced
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