Ref this thread:

https://www.thirdgen.org/techbb2/sho...threadid=196934

I can now hard fault the problem when driving around city streets. Once the engine warms up the rough running and backfiring is happening between 2000-3000RPM all the time. I tested the coil and pick-up coil. No faults found. There still is no code. The car has great power and pull during the first 10 minutes of running. After that is all sluggish,sounds like crap, runs rough and of course the backfiring. I also did a fuel preassure diagnostic. No faults found. As I've mentioned theres no codes in the system and no SES light when the trouble is occuring.

Please someone have an idea on this.

Thanks again

 

The link I posted does not seem to be working. Hers the thread:



Bad intermitent backfire need some help here.
This is bizzare...and its causing damage.

The last month while driving on the highway i've notice a surge and rpm jump at a sustained 2200RPM. Then, on Saturday it happened again. This time I had back fires and tonnes of black and brown smoke out the tale pipe. I couldint get past 2000 rpm. If I stopped or kept below 2000 it was ok. This only seems to happen on the highway. I have no codes at all. I tried to duplicate the problem by warming up the engine from bombing around the local streets. Different RPM in the gears. (350 Auto) but nothing.

So last night I went for about a 30km drive to a friends at around 120 kph no problem. We left his place. I follwed is 4th gen back onto the highway. As we got on we both hammered them all the way up to 170 kph. Then all hell broke loose. My backfire and bogging along with huge smoke reappeared. Couldint get passed 2200 rpm. I pulled over and idled with no problem. This time it backfired so hard the exhaust gaskets blew. So i limped it home at 80 kph no problem. Tried getting it to a 100 kph at around 2000RPM. and it started to backfire again. Put it in idle. Reved it to about 3500 and let off. It backfired hard again. Got it home left it till now started it, and nows theres no problems. It revs perfect. But I know if it hits the highway for any length of time ill be exploding again.

What the hell is going on here?

 

I would find a way to get someone to datalog the events that are happening when these symptoms occur . No code , you scanned it , etc ......


...also .....what is brownish type smoke an indicator of .....come on guys ....... I forget .....

 

I am not sure what the smoke is, but could it be a plugged cat? If the cat is fried, I heard that the results are similiar to what you are describing. Just a thought...

 

Did you check your ignition module and the silicon heat sink paste under it? It may be not functioning properly due to built up heat that is to be dissipated to the distrubutor base.

I have heard of this in the past as a problem..

 

All is well over here now. It was that damn ignition module.

Thanks

 

Edge, how much was it and where did you get the replacement?

 

I got it at Speedy Brake and clutch out in Mississauga. Its $77.00. Its a wells unit. I called crappy tire and they wanted $89.00. That extra $12.00 is for the "guarantee to fail" warranty when you 200 miles away from home in a snow storm.