It cranks, but wont start up even after I have deduced problems by replacing the fuel filter, replacing the ignition coil, tested for spark by pulling one plug (cyl 2) by holding it to the block- it fired, plus I know the fuel pump is good cause we checked for pressure-good and checked for the pump motor sounds-good...its getting fuel, getting spark to the plugs...could this mean I have dirty injectors? It seems like it wants to start - what could be wrong?
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Re: 97 jimmy wont start
Check for a bad distributor cap and or rotor..........a bad cap and or rotor can caues firing (cross fire)across the terminals and introduce spark to the wrong cylinders at the wrong time....... hope this helps.....good luck!
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Make sure battery has a full charge and battery connections all good.
If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
If you having a problem with more than one system, I want to check for rpm signal, that usually comes from the crank sensor. Not sure why you replaced cam sensor? I always want to check sensor wiring circuits before replacing anything. Don't replace anything unless your testing points in that direction.
Pull off the coil ignition cable at the distributor and check for spark coming out of coil when cranking engine over. Use a heavy rag or glove to hold the wire 1/4 inch from a metal ground. Should see a strong blue spark when cranking to verify ignition is good. If no spark, check for battery voltage to coil on the coil primary. If you have current to the coil, suspect a bad coil, ignition module, crank position sensor, or cam position sensor, or pcm. The coil, ignition module, and sensors can be tested before replacing.
Learning how to test a GM distributor less ignition system rather then guessing an replacing parts is the proper way to diagnose . Pulling a couple of pull wires of the same coil an having someone crank the engine over to see if there is spark would the first test . If there is no spark ,could be the ignition module , or the crankshaft postion sensor . GM 3 8L Ignition Control Module And Crank 3X 18X Sensor Test
There's 2 things that an engine needs to start. One is ...it has to have spark to the spark plugs to detonate the fuel fumes inside the cylinders. Check for spark by removing a spark plug the placing the spark plug next to a ground. Use heavy gloves or rubber gloves so you won't get a shock if it does have spark. Have somebody crank the engine. it should fire a blue spark at the spark plug tip. if it does not. Your problem is you don't have a spark. You have to look at several things that might be causing the lack of spark. It could be the coil or coils, the distributer system , or the ignition system such as your switch.
The other thing it needs is fuel. the fuel system has to be workng right to start your car. Check that the fuel pump is working and that the fuel is being distributed properly.
With the brief explanation you gave that's all I can sy for now.
It may be a bad ignition mod,, Autozone test
are OK for batteries and Alternators but not
modules because it's not a real test, mostly
continuity test, not component heat test...
Get a new module and try it...
Did they do a fuel pressure pressure test to determine that its fuel pump? And if so what was the p.s.i.?It should be around 55 to 60 p.s.i. a few pounds under 55 p.s.i. Pump needs replaced, Your shop should have chk. this when it was there the first time. Did they by chance chg. the fuel filter, that can hinder it from starting too.