pug Posted December 4, 2010 Share Posted December 4, 2010 Just installed rebuilt motor was ideling and running great. Now since its getting colder out idels and backfires through throttle body only when i first start up in the morning or sitting more then 8 hrs after it warms up it runs great. Any ideas 1990 2.5 thanks. Quote Link to comment Share on other sites More sharing options...
Pete M Posted December 4, 2010 Share Posted December 4, 2010 faulty egr? Quote Link to comment Share on other sites More sharing options...
pug Posted December 5, 2010 Author Share Posted December 5, 2010 Can a egr valve be cleaned or just replaced. thanks Quote Link to comment Share on other sites More sharing options...
Geonovast Posted December 5, 2010 Share Posted December 5, 2010 Can be bypassed. :brows: Quote Link to comment Share on other sites More sharing options...
pug Posted December 5, 2010 Author Share Posted December 5, 2010 how do you bypass and will it damage the motor. thanks Quote Link to comment Share on other sites More sharing options...
Geonovast Posted December 5, 2010 Share Posted December 5, 2010 Remove relay. Plug vacuum lines. Remove pipe and plug holes. Motor should be fine, they ditched the EGR in 91 anyway. Quote Link to comment Share on other sites More sharing options...
pug Posted December 5, 2010 Author Share Posted December 5, 2010 Ok thanks will do in the morning. Quote Link to comment Share on other sites More sharing options...
pug Posted December 28, 2010 Author Share Posted December 28, 2010 I plugged line removed relay plugged holes took out for drive still backfiring through tbi. Any ideas. thanks Quote Link to comment Share on other sites More sharing options...
Pete M Posted December 28, 2010 Share Posted December 28, 2010 The egr might be stuck partially open. :dunno: Quote Link to comment Share on other sites More sharing options...
pug Posted December 28, 2010 Author Share Posted December 28, 2010 Ok thanks. Will this also cause a lose in power. Quote Link to comment Share on other sites More sharing options...
Pete M Posted December 28, 2010 Share Posted December 28, 2010 can't say for sure as I'm running into the limit of my knowledge on the egr (never had one go bad on me). I know it has caused plenty of grief for guys in regards to warmup and idling. Quote Link to comment Share on other sites More sharing options...
pug Posted December 28, 2010 Author Share Posted December 28, 2010 So i filled up with gas last night drove to work today 60 miles round trip used a half tank of gas. Did not have this problem first 800 miles. Normally get around 280 to 300 miles out of a tank. A ny other ideas. thanks Quote Link to comment Share on other sites More sharing options...
Pete M Posted December 29, 2010 Share Posted December 29, 2010 maybe your fuel injector is faulty and is spewing too much fuel down the tb. Since yours is a TBI, you should be able to pull off the rubber intake hose and see the injector as is works. Quote Link to comment Share on other sites More sharing options...
pug Posted December 29, 2010 Author Share Posted December 29, 2010 I pulled of the hose. looks like it is spraying allright. I have to spare injectors can these be cleaned or rebuilt. thanks Quote Link to comment Share on other sites More sharing options...
pug Posted January 9, 2011 Author Share Posted January 9, 2011 I did all of the above. Today took my son back to college today. Still backfiring through tbi and $90.00 in gas (30gallons) and only 290 miles sometimes i can give it gas and will run good other times give it gas and bogs down and backfires through tbi. It is getting exspensive to drive anymore. Any other ideas thanks Quote Link to comment Share on other sites More sharing options...
Mike Stone Posted January 10, 2011 Share Posted January 10, 2011 Mine is doing the same thing, so if you figure it out please email me. Or PM me, Thanks! Just something i tried was coolant temperature sensor on the intake, it took away my bad fuel mileage, but i still have a rough idle. Quote Link to comment Share on other sites More sharing options...
pug Posted January 11, 2011 Author Share Posted January 11, 2011 What else would cause bacfire through tbi besides egr and fuel injecter. thanks Quote Link to comment Share on other sites More sharing options...
Pete M Posted January 11, 2011 Share Posted January 11, 2011 I was getting all sorts of nasty backfires in my 86 (carbed). I eventually tracked down the issue and it turned out to be corrosion in the feed wire where it attached to the coil causing a really weak spark. but not before I blew the muffler apart. :yes: Quote Link to comment Share on other sites More sharing options...
maddzz1 Posted January 12, 2011 Share Posted January 12, 2011 Try replacing the O2 sensor? Quote Link to comment Share on other sites More sharing options...
pug Posted January 12, 2011 Author Share Posted January 12, 2011 Sometimes it backfires through tbi. Then sometimes it runs like there is nothing wrong for 3 to 4 days. I just changed o2 less then 3 months ago. Quote Link to comment Share on other sites More sharing options...
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