My Car Still Stutters Off Idle! - Help!

[centaurus3200]

hey all,

been a while since i've been here. first off, yes i did a search. seems my problem has happened before, but there's never any resolution to the threads.

basically, you nail the throttle, whether in neutral or under load, the car will "choke" on itself. and backfire at times. feather the clutch to get it out of the problem spot, it's fine.

figured it was the bosch platinums or the wires (which have about 38k on them).

well, tyler was kind enough to help me out. first, changed the plugs. put my old wires back on (about 55k on them - they were fine when we took them off). reason being i had stock wires from a supercharged sho. they had 8k when i put them on, but they had some sort of battery acid on them as he was t-boned in that car.

well, good thing i brought my original plug wires. the acid did a number on the wires and one of the tips broke off in the coil pack after the plastic just disintegrated. which was fine as tyler has like 3 of everything ;-)

we did noticed the car IS running lean (remember baysho dyno day?). the tips were pretty dang light. i will buy a used lpm, if possible. and have the maf curve adjusted. but first things first...

so, bottom line. when the day was done, we had replaced the coil pack, the DIS, the plugs, the wires, the tps from his car, my stock maf AND THE ******* STILL STUTTERS!

what's left? i get no engine codes, but that wouldn't be the first time the computer has been "lazy" with our cars. we were thinking cam position sensor (didn't try another one) or worst case, the timing belt may have slipped? perhaps a bad tensioner?

nick did replace the IMRC a while back (the old one was fine. think the new one is dead now? clogged cat?

i'll leave you with this. once you get the car past 2500-3000 rpms, it still goes like a bat out of you know where.

HELP!

thanks,
Robby

 

[AutoSHO]

Sounds familiar. I've been dealing with the same problem off and on for about a year. New plugs and wires seemed to cure it, but its slowly coming back now. I can't figure out whether its dirt in the plug wells giving an arc path, or a sticking injector.

 

[Denny]

Sounds like the problems I used to have with mine back in the day. Nothing seemed to solve it, and it was down on power, I mean alot, I dynoed about 125 horse at the wheels. Turned out the timing belt was off by a tooth or two. Re-adjusted that by installing new belt and I had a real SHO for the first time

Check your timing

 

[Rockledge]

Maybe a TPS "dead spot" (or something related to the TPS)? Worth checking, IMO:

http://fordfuelinjection.com/index.php?p=30

 

[centaurus3200]

we did try tyler's from his perfectly running 93. same issue. we were sure this was the problem as my NEW tps was jacked during the second 60k about 38k miles ago.

Robby

 

[centaurus3200]

now, i don't want to jinx it, but the car seemed to
have actually been nice to me for once!

took the car down to nick chrimes'. he ran the codes. alan
and my vintage hi-fi friend ran them twice before.
usual. maf. which is just because it's a pro flow
80mm.

BUT, the check engine light stayed on after the codes
were ran. this is where it gets interesting. when the
CEL is on, she runs like a ***** ape. when it turns
off, cough. cough, stumble stumble. CEL light kept
going on and off.

went back to the shop. nick ran the codes again. MAP
SENSOR! YAY! i figured it might be this little bugger!
borrowed one from nick and VROOOOOOOMMMM!

so, thanks to nick, alan, tyler and all for helping
me. and george as well for tipping me off to the map
sensor. i guess the computer wouldn't throw a code
until the ******* totally died.

i'll keep y'all updated if she reverts back to the flu
;-)

see ya,.