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 $$ into the car without fixing the problem! Please give your ideas.
So far we have changed Throttle position sensor, Check EGR valve, seems to be fine, opened up cataytic converter, no difference, got used PCM and even tried a 2nd, no change (dont want to buy all these parts new to find out they dont make a difference!). Unplugged O2 sensors, no change.
The first day we got the 12 code (common I've read) Next day after unplugging map sensor and TPS we got codes for those (dont remember exactly what they were) Next we got 12, 14, 23, 24 (yesterday) today after changing out the PCM and then back to the old one, letting it run a bit to get codes, it comes up with only 1 code again (12)
We just changed all spark plugs and wires, manifold gaskets and some other gasket, trying not to pour a ton of $$ into the car without fixing the problem! Please give your ideas.
May 7, 2010 at 4:49 PM