1994 Chrysler LHS 94 LHS 3.5L Rough Idle, No codes

MIMZIE

MEMBER
1994 CHRYSLER LHS
6 CYL
2WD
AUTOMATIC
133,000 MILES

I have a 1994 LHS 3.5L that runs rough, sometimes it will purr along for about 10 seconds then die down and either stall or goes back up to regular idle. Pushing on the gas pedal makes it sputter sometimes.

So far we have changed Throttle position sensor, Check EGR valve, seems to be fine, opened up cataytic converter, no difference, got used PCM and even tried a 2nd, no change (dont want to buy all these parts new to find out they dont make a difference!). Unplugged O2 sensors, no change.

The first day we got the 12 code (common I've read) Next day after unplugging map sensor and TPS we got codes for those (dont remember exactly what they were) Next we got 12, 14, 23, 24 (yesterday) today after changing out the PCM and then back to the old one, letting it run a bit to get codes, it comes up with only 1 code again (12)

We just changed all spark plugs and wires, manifold gaskets and some other gasket, trying not to pour a ton of $$ into the car without fixing the problem! Please give your ideas.

1 Reply

MIMZIE

MEMBER
2 POSTS

Coming back to update. Turns out the timing was off on this car! Barely off but just enough to make it not run! The guy we got this car from said he had the timing belt changed and some other things, he drove it for a while (weeks), went over some railroad tracks and it just wouldnt stay running after that.

What we have gathered is that the people that changed the belt forgot to take the pin out of the thingy that belt is on (real technical I know) Some timing belts have something you just tighten, this one has a piece that you have to push the pin in, get an allen wrench(a very tiny one!) And slide it in the hole to keep the pin pushed back so you can put the timing belt on, take the wrench out and this pin pops into place keeping the belt tight! Apparently the guys forgot to take the wrench out, when he went over the railroad tracks, the wrench probably snapped, popped the pin out making the timing be off by just a smidgen. Car has ran fine since and all those previous parts I bought were not needed (Luckily we didnt buy too much for it before we figured out it was the timing!)