Questions & Answers for: check engine light 1999 gmc

...Check Engine' light stays on after the engine has started, but everything is running smoothly. The truck seemed to be a tad lazier on cold starts, but I didn't take notice until today, when the Check ...

...hesitation. Do I need a rebuilt tranny, or is it possibly something way less expensive that could be wrong? Is the check engine light on? If not chances are good that you have major trans.

The problem seems to be getting worse. Any suggestions as to why? Could be a defective pcm (computer) also bad grounds can wreak havoc on electrical systems check engine light on before this happened?

check engine came on and i have a self diagnostic machine... the machine said it was the secondary air filter. any ideas 2003 GMC Jimmy. My check engine light came on and I don't have code reader, any

...Check Engine Light, or it?s already fixed, and you just want the engine light out, visit an auto repair store. Most stores will have a universal Check Engine Light Code Reader that can quickly and ...

engine light on, will not start The first thing i would do is have the computer scanned for codes and see what codes are stored, you may have a bad fuelpump or a control module problem, check for fuel

the next thing to check is fuel pressure with a gauge.  GM vortec engines require 60psi or more to run.If the check engine light is on you should also have the computer scanned for trouble codes

1999 gmc jimmy diagnostic tool hook up wont work diagnostic tool wont connect Does the check engine light come on when you turn the key switch on ?? Did you check the cig lighter fuse ?

...Check for "Engine light" and any active or stored engine codes. Running a cylinder compression test, fuel line pressure test, exhaust pressure test, check the timing, check for misfire, check for ...

...The distributor may ... This can cause a rough running engine or stalling condition, the Check EngineLight may or may not illuminate. ... 1999 GMC Jimmy150,225Visitor. try turning your lights off