https://www.thirdgen.org/forums/tpi/...-stumbles.html


Any ideas here? I am going to to run down this afternoon and pull another distributer from a TBI truck in one of my storage yards....Hopefully that will fix it for good.


Jason

 

does it backfires when it stumbling? A backfire indicates that it could be an ignition problem. but its sounded very similar to what i had. it ended up being a bad distributor. but also check out the fuel system. change out the fuel filter

 

No, no real backfiring....A little coughing at the intake, but not bad. The fuel filter is also new, forgot to mention that. I am hoping another distibuter solves my problem. I refuse to put much money into this car, I am already in it about 200 bucks, plus 140 at DMV...Not bad at all for a 92 Z in good shape, but I still don't wish to drop much more cash into it. If I go over 500 total, it may be looking for a new owner, as I have too many other cars I could be throwing money at.

Jason

 

Let me know if you do sell it. Any idea on what you would ask, I may be interested?
Oh, sorry, I sounded selfish there.I hope you figure it out, Mine was a distributer also.

 

the distributor went out on it recently?

 

No, on my 87. This car is still running strong.

 

 

My distributor caused similiar conditions, Lots of backfiring though, It would run for a few minutes when cold, but heat would kill the pickup, I went ahead and replaced the whole dizzy.

 

OK...I swapped out the distributer for another, seems better, but after idleing in the driveway for about 20 minutes, it sort of stumbled for about 10 seconds or so, then cleaned up and ran another 5 or so before doing it again. The tach is not jumping like before, but it still started running bad for a bit. Near the intake, it sounded like air being sucked in back by the rear of the engine while the rough running was occuring....checked for vaccum leaks by spraying carb cleaner all over around the intake and came up with nothing. Next thing I think I will try is hooking up a fuel pressure gauge and watching that...maybe it will fluctuate as it stumbles? I am not understanding this stinkin' car.

Another thing, when it stumbles, the exhaust fumes are pretty bad, also after revving the engine...

Jason

 

wow, sounds like your having the same trouble i had with my camaro, Never did figure out why i was able to tune out the rough idle one day, and the next day the idle would go back to rough... checked Vacume hoses, ect... drove me nuts.

 

Jason, I have the PROM software to data log it if you need to read it on your laptop. Just have to remember what Camaero tought me to get it on the right setting for that.

 

Do you have the capability to retrieve data from speed density? If so, I will gladly take you up on that !

Jason

 

I sure hope so, 'cause my '54 is gonna be SD. Call me tomorro when you get time to meet in A town. Is there a difference in the rear hatch on the non mech. type? check out the thread on my hatch. I never pulled the rear interior loose on my 84.

 

Well...I was through with messing around with it and dropped it off at a buddys repair shop, it ran fine all day while hooked up to the scanner and after they put a new cat on it (old one was punched out), the car passed smog just fine. It does not run rich, just with no cat it smelled like it. The car actually runs a little on the lean side they said. Who knows, maybe it will be a good car now..?

Jason

 

OK...the car still does it, but now the tach does not jump around, only fluctuates as the RPM's do...It smells as though it is flooding out and smells as such when the problem occurs. I am going to check all of the vaccum hoses around the MAP sensor and replace the coolant sensor....The search goes on.


Jason

 

checked ur fuel pump, filter. injectors?

 

I "really" doubt it is fuel related, this morning when it started stumbling, I floored it from a stop and it spun the tires through second gear...plenty of power, so it is not starved... I think ignition or a sensor causing ignition symptoms...

The fuel filter is new...

Jason

 

I think its ignition as well. I don't know neough about bad map sensors, I doubt it would be that though, I also doubt it's the coolant temp sensor. That is just a modifier for coolant and timing versus temperature. With it unplugged, you probably wouldn't even notice much difference if the car was fine.

 

check out the ecm.

 

Changed out the MAP sensor last night, no problems today....did not drive too much, but more than normal..

I am hoping that was it.

Jason

 

Wow I am stupid.

 

I doubt you are stupid....Just think I got lucky...


Jason