Quote:
Originally Posted by RIP
Uh boy. You normally clean the port in the throttle body first, then you test it, then change it if it tests bad. Well, anyway you've eliminated a good possibility so what's next?
Just a list of possibilities and nothing to really latch onto:
> I'll assume it backfired out the intake. That can be an indication of a lean fuel condition. Fuel pump, injectors etc. You can connect a fuel pressure gauge to the fuel rail test port and measure the pressure off the pump. Could try a can of injector cleaner or have the injectors flushed. Lack of acceleration can indicate a weak pump.
> Could be a vacuum leak. EGR valve, vacuum line, intake gasket etc.
> Chance of a weak igntion spark. Weak battery, alternator output, loose/corroded connection, weak coil output, worn plugs or wires or both. Have the alternator and battery tested. Best battery test is a load test. You can test alternator output as stated in my first post.
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I cleaned the port in the throttle body first and i got the IAC for free so i threw it on lol. It did backfire out of the intake. Im getting good acceleration so i dont think it's not the fuel pump. I put in a bottle of injector cleaner no change. I did get two trouble codes one for small evap leak and a large evap leak found and fixed two leaks haven't gotten the codes since. Im guessing it's not the EGR valve since i haven't got a code for that one yet. The battery is new and the alternator is testing good. Plugs, Wires, Coil Pack new a few months back. Also it hasn't backfired in about a week or so. I've also noticed under heavy acceleration it somtimes backfires and there's alot of black smoke from the exhaust not sure what that means. Also just found out my van is Egr delete
AHHHHHHH this is driving me crazy lol.