i have a 1992 stealth with 40,000 miles on it; i just had my sparkplugs and wires changed and my car is still missing like my plugs are misfiring. what can be another reason why my engine is still misfiring? also, when i try to locate a distributor cap and rotor for my car on the autozone site it says it is not required! does my car have a distributor and where is it located? any help would be appreciated!

 

If you have a DOHC motor, you car is not equipped with a distributor. There are 3 pairs of coil packs that fire the plugs. It gets the signal to fire from the CAS>ECU>PTU>COILS>PLUGS.

 

yes i do have the dohc, r/t; where are these packs located?

 

On the front bank of cylinders, left hand side, you will see a set of 3 coil packs. You will be able to identify them as they have the spark plug wires in them.

 

I wish you all the luck in trying to figure out what is causing your problem. I have changed new parts and tried parts from another engine and it still misses. Never have had problems like this with any other car that I have owned. Being a rural mailcarrier have lost count of the car's that I have owned over the past 30 years. The Stealth's DOHC engine is "fast" but very hard to troubleshoot. I'm still pondering selling it or keeping it. The fact is even though the car is 14 years old it still is a very nice looking car that still turns heads. Not many other cars can do that. My ego is on the line here,so I want to figure the problem out. I probably will keep it. But I do get frustrated. I don't have a service manual for it but I bought the ALL DATA program for the 92 Stealth and it's very usefull. The engine itself is fairly easy to work on. Good Luck!

 

thanks for the info; also do i need to replace all three packs because they are pretty expensive?

 

Before you spend the money for new coils, try this; while the car is idling, one at a time, unhook each spark plug wire from the the coil. Note the change in the idle, replace the wire and move on to the next wire. If you unhook a wire, and the idle doesn't change, you'll know that is the faulty coil. Tip: were a thick leather glove when pulling the spark plug wires, they can give you a nasty jolt if you know what I mean.

 

i've taken each spark plug wire off individually and with each removal there is a slight change in idling but not much to say it is significant; should i take it back to the place where i got the tuneup and if so what should i have them do?

 

Hello, I am sorry your tune-up problems.

The very first thing I would do is to determine if the problem is a result of “closed loop” operation.
This is fairly easy to do, but requires getting access to the wiring into the ECU and doing some simple wiring modifications.
You can “trick” the ECU into operating in the “open loop” mode by disconnecting or grounding the coolant sensor signal. This will force the ECU into ignoring sensors like the O2 sensor and will run the engine according to a “look up” table stored in non-volatile memory.
If the car then runs reasonable well, you’ll be able to assume that some sensor or signal into the ECU is causing the problem.

If you need detailed help to guide you through a step-by-step process to isolate the problem, let me know and I’ll send you web-links and technical specifics.

regards and good luck!