 
     |
| 85 SE V6 engine running bad (Page 1/2) |
|
cvxjet
|
OCT 23, 02:48 PM
|
|
My 85 SE has the F-body 3.4 swap....has always run a little off (Especially slow/around town) but now it is running worse. When I start it it does not go to high idle, and then cycles up and down almost dying at times....after warm-up it has a very slight lope to the idle. Also, when I shift above 2000 rpm it gives off a horrible sound from the exhaust.
I have changed out the MAP, TPS, Oxy sensor, MAT.....Ignition; the wires, plugs, cap and rotor...and now the fuel injectors. Very slight improvement with the OXY sensor, but ran worse when I swapped in a new IAC (Re-installed old one)
Any idea what could be wrong (Besides the "Loose nut behind the wheel")
Any help would be appreciated.
|
|
|
|
olejoedad
|
OCT 23, 05:34 PM
|
|
|
Have you put a scan tool on it?
|
|
|
|
cvxjet
|
OCT 23, 07:26 PM
|
|
A) Have had no codes show up, and B) I bought the scan tool adapter setup for my computer years ago but could not get it to work- and now I can't find it...
(Funny/Ridiculous addendum; I fixed computers at Atari back in 1982- actually came up with a fix for a problem in one week that took their head tech 2 months in his lab to solve- But I can't PROGRAM a computer to save my life)
|
|
|
Patrick
|
OCT 23, 08:03 PM
|
|
| quote | Originally posted by cvxjet:
I bought the scan tool adapter setup for my computer years ago but could not get it to work- and now I can't find it...
|
|
Do what I do in this situation... buy another one. 
|
|
|
|
82-T/A [At Work]
|
OCT 24, 08:36 AM
|
|
| quote | Originally posted by cvxjet:
A) Have had no codes show up, and B) I bought the scan tool adapter setup for my computer years ago but could not get it to work- and now I can't find it...
(Funny/Ridiculous addendum; I fixed computers at Atari back in 1982- actually came up with a fix for a problem in one week that took their head tech 2 months in his lab to solve- But I can't PROGRAM a computer to save my life) |
|
You are my new best friend CVXJet... are you buying the new Atari 2600+ that just came out? It ships next month... I have two on pre-order...
Yes... it plays 2600 and 7800 games, and has a 4-core RISC processor, haha...
Anyway, some thoughts on your situation. I had a very similar situation in which I basically replaced like... EVERYTHING on my car, pretty much everything. And it turned out to be my catalytic converter. It was a 1997 Grand Am GT (loved that car), and actually... I got so frustrated that I ended up selling it with that problem. I asked the new owner that if he ever figured out what the problem was, to e-mail me.
He found out a month later... after pulling the motor... that it was the catalytic converter. He was pissed because it was such a simple thing. The cat had melted in on itself, clogging up the cat. For me, this happened slowly, which resulted in a gradual decline in engine performance until one day it just more or less closed itself off. It could idle fine, but anything over 1,200 rpms (basically anything above a crawl), it would studder and die. But it got gradually worse over time, but then got REALLY bad all of a sudden while I was on the highway.
Anyway, this COULD be your problem, and no amount of code checking could give me the answer (and that was OBD-2). Honestly, not sure how you check it without actually removing the cat... but this is my thought. For what it's worth, it was caused by a "rich" condition.
|
|
|
|
cvxjet
|
OCT 24, 12:21 PM
|
|
No-no....I have a dog- but no cat! Actually, 10 years ago I had a tuning problem...solved it and went for a drive on Mines road (Ranch land + outdoors)(And lots-O-turns)...car started dying.....waited ten minutes and it would re-start....Got her home- never could figure what went wrong.....then couldn't pass my CA smog-check...had to replace the CAT.....and it was an empty shell! (Must have been coming apart and clogging during that drive)
So I had an extra flange welded into the exhaust down-stream from the CAT and then a CAT-less pipe made up so if things start going wrong, I can remove the CAT....And the CAT looks fine, at the moment (But lonely)
I have one more sensor to replace- the engine temp sensor...try to do it today.[This message has been edited by cvxjet (edited 10-24-2023).]
|
|
|
|
olejoedad
|
OCT 24, 04:42 PM
|
|
Where do you suppose the contents of your old cat ended up?
Has the muffler been replaced since the cat was eliminated?
|
|
|
|
cvxjet
|
OCT 24, 09:20 PM
|
|
Picture of old (Dead) cat.....
(Shaken out of exhaust system)
|
|
|
|
cvxjet
|
OCT 31, 02:11 PM
|
|
|
Well, I tried resetting the compuker...It seemed to run a bit better but the idle goes thru fluctuations sometimes now- almost dying every once in a while.
|
|
|
|
Patrick
|
OCT 31, 02:15 PM
|
|
|
|
|