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you know i have the same problem. I can't remember if it started after installing the highport cam in my lowport but when creeping in traffic, the car will start bucking really bad and I'll have to clutch in.
I know I have a light misfire at idle but I have no CEL (except 0304, knock sensor). I replaced my plugs, wires and disty cap & rotor and I still have the misfire and the bucking.
Other than that I don't have any problems.
kinda curious if you guys figure out your problem...
That actually sounds very much like my prob too whew, feels good to have someone with the same prob (as strange as that sounds). Ya, it's really bad when I start letting my car creep and you can feel the engine pulsing/bucking, neutral is worse too.
Too bad you haven't been able to find the solution either... I'll keep on posting things Raene and I mess around with.
ECT sensor has tested cold resistance at 12 ohms (no typo), whereas it should be 2.1-2.9k ohms... replacement coming and we'll post updates then
Awww, babe. You posted in the wrong thread again. haha, this must be getting confusing. The ECT goes with the stalling problem...
So no Harris81, we haven't done anything yet. and I'm almost starting to get used to my car pulsing. I'll just have to swap the old cams back in if I sell the car.
__________________ Wishing I could be topless all the time......
In the last 2 months my idle has gotten A LOT worse. Sometimes it feels like it's going to stall and sounds like a diesel.
There were two codes thrown over the weekend P0300 and P0304. (Both misfire cyl codes). Both sodes happened while idling. With the car vibrating more then ever I took it for a diagnoses.
They found the timing advanced 7 degrees. (I was using reg gasoline.) The fuel trim data was more than 20% positive L-T and S-T.
The idle prob didn't happen till the minute after the '91 cam install. what could be making the computer advance the timing to sich a high degree?!
EDIT: I should add when I got into the car and started her up, the idling was PERFECT. I was amazed and about to tell them they got it! However, as I drove home (10 min) it got worse, and when I hit my driveway, it was back to the way it was yesturday. I'm going to check the timing tonight to see if it's advanced at all, I'll post after I'm able to do it.
Last edited by chucky200sx; 03-09-2004 at 09:30 PM.
your misfire is causing the car to buck and knock. Your knock sensor is picking that and sending to ecu. the ecu in turn starts pulling timing out in 5 degree increments untill the knock is gone or 0 degress IIRC. that's where your timing is going. regular gas isn't helping any either. try running premium once and see if the problems eleviate themselves a bit.
go to the idle solutions at the top of the technical sections page and start doing the tests. You'll be surprised how much you'll learn.
your misfire is causing the car to buck and knock. Your knock sensor is picking that and sending to ecu. the ecu in turn starts pulling timing out in 5 degree increments untill the knock is gone or 0 degress IIRC. that's where your timing is going. regular gas isn't helping any either. try running premium once and see if the problems eleviate themselves a bit.
go to the idle solutions at the top of the technical sections page and start doing the tests. You'll be surprised how much you'll learn.
I'll throw in premium gas tonight, my tank is empty. ya, I had no idea the timing was so advanced, otherwise I would have used different gas/brough it back to stock.
And I've done like 90% of those things on the idle solutions pg. Not one of them helped a bit.
I really think something got fu*ked up during the '91 cam install, possibly a valve for example? It's just too much of a coincedence that the idle problem started happening the first time the car was driven after the swap. I just don't understand why; like 5 months later; it's gotten so bad...
erg I'm worried about detonation if this keeps up (if it hasn't happened already)
Last edited by chucky200sx; 03-09-2004 at 09:55 PM.
if you really tired them all already, you would at least find something will make it better or worse.
If all your problems started with the cam install, then that's probably what went wrong. The 91 intake cam is such a small difference, it won't affect idle really at all.
the reason the bigger cams give you bad idle is because of the valve overlap.
the only way the 91 cam would give you bad overlap is if jumped teeth on the sprocket. Did you do the cam install correctly? It may be worth the peice of mind to pull the valve cover and check.
5 more months of fu*king around would be worth pulling the cover and checking. just my 2 cents.
Don't know if this is possible without causing electronic damage so confer with others...but...maybe you could unplug each injector in turn and see if one of them doesn't make a difference to the idle?
I installed a highport cam in my p10 and instantly idle at 500. the car was also idling lumpy or lopey and would shake like it was a v8 I was running 93 octane. This went on for about a week. My idle went back to normal of 800 but the engine would still shake. It would also stall if I didn't keep my foot on the gas. I didnt have time to leave it in cause autocross starts next week so last night I put my old intake cam back in. The car started right up with no problems or idle issues.
All so once I started driving it would run fine but once I would go into nutral it would die and I would have to pop start it. Or keep my foot on tue gas coming to stops.
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whew, feels good to have someone with the same prob (as strange as that sounds). Ya, it's really bad when I start letting my car creep and you can feel the engine pulsing/bucking, neutral is worse too.
I'm worried about detonation if this keeps up (if it hasn't happened already)
