93 Park Ave. Series 1 3.8.

I know its way too old...

Been having alot of issues with the car misfiring, surging, and not starting. Last night when it would not start at all, I replaced the ignition module, and then it worked. This morning car is surging and misfiring. Codes 18 which is a cam/crank error, and code 42 which is electronic spark timing, keep appearing. I have replaced the wiring harness for the iginition control, the crank sensor, coils, harmonic balancer, and god knows what else. Even put the camshaft magnet in to fix the code 41 years ago.

Had the guys at the shop look at it while I was tinkering about it for those codes, and when I fired it up, they told me my EGR valve was leaking! lo and behold, the mysterious exhaust leak that I have been unable to locate for months! So, I have a plate to block off the EGR rigged up, to see if this helps when I get to the shop in the morning.


My question. will removing the EGR ruin the motor? higher combustion temps? the 92 3.8'* did not have one that I have seen.

Second, has anyone ever had problems with codes 18 or 42?

Removing the EGR is illegal and you won't pass emissions without it.

That said... I removed mine over a year ago and have had no issues. EGR just recirculates unburned exhaust gasses. You *may* notice a slight decrease in MPG.

The engine is a 93, so does not have to pass emissions. No, removing the EGR will not hurt your engine. I've been running without one for several years now.

The valve is all broken up, and leaking exhaust. Engine runs terrible. I already have a pile of $$ in this thing this month. I can live without one till I can cough up the cash for one.

No emissions testing here. Already removed it on the chev. No issues, but I wondered about the 93 because its newer.

Will running on premium lower combustion temps and improve performance and MPG? The stuff we have here is e10..

Running premium is not going to improve your performance or MPG on an NA motor.

Sounds like you should be good to stick with the EGR delete. Just make sure you seal it well, I put a little red RTV around my block off plate to make sure it sealed.

Well, after fabricating my EGR plate today, it runs quieter and smoother. The mysterious exhaust leak that I could not find! The reason why the car ran terrible on cold cold mornings (its canada here..) until it warmed up!

Most times it would just die, like i'd lost ignition power, sometimes in the driveway, and sometimes on the road. It restarted most of the time, but the problem would go away and not come back for a while, making troubleshooting hard to do.

Now I got a code 56 on the scantool at work, which is a quad driver module, for the transmission and EGR. The two codes I had before I installed the plate on the EGR, were codes 18 (cam/crank error) and 42 (EST error). I drove it home, and jumped terminals A and B at the diagnostic connector, and got a code 55, which I will do some research on soon.

Lot of people told me it might burn the motor up, but maybe it makes it run better? I removed it on the chev and it runs fine. I could get used, but what are the chances of it being trouble free versus a new one?