Having some engine trouble.

[Jordan]

AFM is completely spotless inside and out. Havent tested it yet.

TPS was well oiled, but tested OK. I cleaned it, and it tested OK again.

No signs of any air leaks or anything of that sort.

I cleaned all the connectors to the AFM, and TPS. The TPS one being wet with oil.

I will remove all the spark plugs, clean them, reinstall, reassemble the engine.. and try again.

[Jand3rson]

Need to find the culprit before this weekend meet or I won't be going.

My ass you're not going... :evil:

I don't care if I have to smack your silly ass upside the head with a 2 x 4 and throw you in my trunk.

[Nick325is]

Someone else has this problem also :x . I have had this problem for a year now. It started out as a random cutting out around 6000rpm and then it gradually got worse until it wouldn't go past 6000 at WOT. At partial throttle it will go all the way to redline.
I have replaced the following since then and haven't fixed it.
-New TPS
-Tested CPS
-Plugs
-wires
-distributer cap
-rotor
-tried a different ECU
-fuel filter
-octane booster

None of these fixed the problem. I am thinking now it might be that damn sensor below the throttle body.


Nick

[blunttech]

clean the electrical connection at the afm

[Fred]

Fred, I can pull to 6940 without any problems at part throttle. (posting from work)

Check the AFM or TPS.

[KenC]

check the TPS

Just make sure that you use a coversheet. :D

JK, man. I hope you get this figured out before Sunday!

[Jordan]

Yeah, one of the mechanics suggested to check the TPS for oil. That seems very likely, as it likes to pool there.

[oh2fly]

Jordan, I know I am late to the party here. To reset the adaption in the ecu, you need to disconnect the battery cables and connect them together with a jumper wire not just have them off the battery. Check for any obstruction going in your intake. At an autocross2 years ago, my car lost 1/3 of it's power. We traced it to the wiring harness for the driver's side H1 headlight sucked inside the opening and blocking off the air to the afm. Just a thought. Definitely check the tps with a meter. Oil inside could cause all kinds of problems. If the tps goes to closed contact for the idle switchwhile accelerating, it will cut off the injectors just like coasting does.

[Jordan]

Fred, I can pull to 6940 without any problems at part throttle. (posting from work)

[86325e]

How old is the CAT? Could be starting to clog. That would affect your top end like that and then just get worse. Have the pressure checked.

[Jordan]

I haven't tried accelerating beyond 6k at part throttle, I will today on the way to work.

While at work I will check my fuel pressure, and the spark plugs.

[Screaming_bmwe30]

although i'm running Megasquirt and a turbo, your problem sounds similar to the one i'm having........and i used to think it had to do with my fuel tables. I have all new fuel system parts....and Motronic is not controlling fuel at all...and i'm sure i'm running rich under WOT...but it still cuts out around 5500-6000, depending on the boost level i am running.

I have a feeling it's ignition related....and slightly fouled plugs could be causing it to miss when combustion pressures are highest. Obviously when a plug is slightly fouled...it's harder for the spark to jump...but when you add pressure as well from either boost or just high rpms'....that may be enough to cause a missfire.

Have you pulled the plugs yet just to see what's going on? Maybe just swap in new plugs anyways....gap them to .025, and see if that cures it. i'm running 2degrees colder witha .025gap when running 10-12psi...but if i run low boost...my plugs sometimes foul....and i get misses at higher rpms, that's why i'm thinking this coudl be the prob. i know with a chip...and an adjustable FPR...i always ran a tad rich at WOT....so maybe that is fouling up the plugs??

[Fred]

How does the car run under partial load? Does the car accelerate to redline without a problem if you don't floor it, or does the problem only occur under WOT?

I didn't think it would be the crank sensor. If those go bad, your car wouldn't start or it would just quit suddenly while driving.

[kowalski]

latley a lot of people are havin problems with the throttle positiong sensor disconect the battery pull it off and see if you can red line it... could it be a fuel problem? not getting enough fuel at the high rpms? regulator or pump is shot? i duno just throwing out ideas. do a compresion check to see if you'v got a cracked head that way that can be ruled out, should be arround 180-190 i believe. check the spark plugs like robbieosterman said. check your coils. check the plug gaps. fuel filter? also unlikley but could be the purge valve for the emisions controll. what about a vacume leak? anyways those are all the things commin to mind good luck on finding the culprit.

[robbieosterman]

Okay, I had a similar problem at W.O.T (at higher RPM's) it would hesitate and the RPM's would sputter. It would gradually get to the redline, but very reluctantly.

I fixed the problem by sanding off the spark plugs (they were about 11k old), retarded the advanced valve timing, and put in my old (stock) chip.

After I started the car up, no more problem. Hope this helps.