Check fuel injector pulses. Compare front to back.
SOURCE: 2005 chevy colorado runs rough and gets bad gas mileage.
Sounds like it needs spark plugs and wires, and a fuel system treatment.
SOURCE: 82 corvette crossfire injection, engine
Please go to the crossfire injection forum to get some straight answers to the 82 corvette CFI system and how to troubleshoot it properly. There's a lot of misinformation given here, so much so, I don't know where to begin.
One thing is, the 82 corvette CFI does NOT have a MassAir Flow sensor system, it uses MAP and O2 mostly. The CTS sends a signal to the ECM telling it what the temp of the motor is and in turn the ECM controls the amount of fuel being dumped. On the older (orignal) CTS sensors, they have one wire and takes its ground from the threads. If any coorosion takes place, usually the CTS will report a cold engine and request lots of fuel.
To repair this issue, install one of the newer style CTS sensors that have two wires, one for signal and the other is ground.
Fuel pressure and vacuum leaks on any CFI motor play key roles. Set the FP to 14-15psi measured inbetween the TBs. The regulator is located on the rear TB and must be slightly moded to make it adjustable and can be done in a few minutes.
SOURCE: 1988 nissan pickup engine rotates but does'nt start.
it sounds like the injectors are not opening up man.. replace the injectores and this should fix your problem..good luck keith....
SOURCE: 1999 pontiac grand am 4 cylinder rough idle, rpms fluxuates
Most likely your throttle position sensor is faulty. You could have a vacuum leak as well. Most probable cause is a bad sensor. Is your check engine light on? Have you checked your engine codes? You can go to autozone.com and register for full free online repair manual.
Testimonial: "the check engine light had been on but we unplugged the battery yesterday for a couple of hours and put it back in and the light isn't on anymore. "
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