99 tahoe will only start when bypassed

in order to replace the cam seal you have to remove timing belt if tou did not have this problem before you have one skipped thoot on your subaro box engine recheck your timing again

This could be a wheel speed sensor. The ABS module does not do a rationality test to sensors. This must be monitored by a scanner WHEN acting up as they send information to the controller which makes the decision if the car has traction or not one of the sensors is sending false data. this happens at low speeds 15 mph or less . the controller does not tag it as a bad reading because it is random even during your brake application. As for the transmission not shifting this also can be a bad sensor on the transfer case output shaft. Does speedo act crazy during this shifting problem. check for loose ground straps.

That little slide on wire for the starter solenoid is the answer. Squeeze tight or replace with new and start! : )

99% of the time we mechanics tend to trust computer of what it tells us when it come to engine diagnostic; i hate to not agree with VW mech which he pull the code and state is knock sensor although I have ran into computer spit out many wrong code and still does not fix the problem however I go ahead and replace it any way. Now if that does not fix the issue after replacing with new parts, I then would go back and plug computer back in to see what other code it would spit out. my opinion, I would also have your air-mass flow sensor check, some people don't realized throttle control/airmass flow sensor also link into the ECU compute between the revolution sensor of the transmission telling computer is time to shift. faulty air-mass sensor can also cause it to bogs or not picking up speed giving a false sense the transmission is not working correctly. you can go to auto zone and use their computer for free if you need to re-pull the code after replacing the knock sensor.

If you can give me the codes I can help you out with the problem.

I just took my 04 Tahoe in for the same thing and it was the a/c actuator.

replace fuel pump relay. check all fuses to ignition and pcm .make sure they are not loose. check coil wires make sure they not loose.look at battery if you have the ac delco seal battery make sure green eye still there .if its black have battery check out.

The solenoids are located in the transmission. There is one for the 1-2 shift point, one for the 2-3 shift point, and one for the 3-4 shift point. You have to drop the transmission pan to access them.

According to the fault code, there is no signal from the vehicle speed sensor to the OBD computer. A P1491 code is the radiator fan control circuit. I sounds like you may have an electrical problem that is causing a bunch of false readings. Have the computer reset and try again. You can get all of the fault codes at http://www.wjjeeps.com/faultcodes.htm#0500 Don't forget top rate this solution!!!

throttle position sensor, but check fuel filter first