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.
or cranks robustly (the crankshaft spins fast) but wont start.
all cars that dont start one, all ran when new. etc.
what counts is the now. only.
you need to do the tests. all covered in the FSM or at alldata.com
i cant help you because you . cuz did not say crank or start? so......
1: test all fuses. (not just gandering, use a meter)
2: check battery voltage 12.6vdc rested.
3: if not cranking, wiggle the shilter (a/t) or clutch if m/T
if a/t? try cranking in Neutral. cranks now? bingo.
4: cranks ok, and fast so check spark/
ill end there, due to vast number of tests and no clear stated
ever give it a full tuneup (60,000 mile service schedule?) or this DECADE. if not why ask the spark plug question.
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.
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...