Question about 2000 GMC Jimmy
I have changed my fuel filter, my fuel pump, and fuel is getting to the injectors, and i have spark...but the truck will still not start I am getting fuel and spark but will not start.I have replaced the crank sensor after reading about so many people having the same problems,but didn't work.I am going to try the coil next.
Check your battery voltage first sir! it should not be at most 12 volts. if it's almost 10volts or lower, then it needs recharging or replacement, (which ever you prefer! you may having spark at 10volts but its not enough to ignite the air-fuel mixture inside the engine.
check also the air filter, there should be not water trace in it! check oil, should not be milky.
Posted on May 28, 2009
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Posted on Jan 02, 2017
SOURCE: 1991 Chevy S10 Pickup
First check for battery voltage. Then make sure you have a check engine light when the key is in the run position. Make sure the fuel pump relay is good. Check to see if there is power on one side of the injectors, if these wires have a short to voltage or ground the injectors will not funtion properly. In this system the injectors are supplied with constant power and ground controls pulse width. In these blazers and s-trucks PCM ground sees to become an issue. In mine I directly routed the system grounds to a metal body panel under the right side of the dash. In my Blazer I swapped out the motors and converted from and automatic to a manual transmission. And another problem I found was when I lifted the dash to install my clutch pedal, I broke my brake light switch. In an automatic the brake pedal switch interups the ses light circuit. If the PCM dosent sense the ses light on the system cannot ground. Good Luck with it, At the time I had completed my second of four automotive level so it took me a bit to figure it out on my own. Once I took my level 3 (electricl) it sunk in alot quicker. Happy hunting, don't get too pissed off.
Posted on Nov 19, 2008
check the fuel pressure to determine that the fuel pump is still good. there should be a schrader valve with a plastic cap on it on the fuel supply line that goes to the throttle body or if you have one fuel injector per cylinder, you will have a fuel rail that feeds each injector that will have the schrader valve that you screw the fuel pressure tester on. most fuel injection systems run 30 to 40 psi, but check a service manual or call a dealer to get the correct psi for your vehicle. if the fuel pressure is within specs, it sounds like the MAF (mass air flow) sensor is the culprit.
Posted on Oct 14, 2009
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