98 Chevy Suburban, engine turns over, will not start
I have a 5.7L engine, I get spark at all 8 plugs, when I spray starter fluid in the intake I don't get combustion, the ignition coil and ignition control module test fine. my next thought is the starter because when it seems to try and start it slows down and seems to backfire, almost like it is overloading the starter. not sure about the compression.
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Re: 98 Chevy Suburban, engine turns over, will not start
It is possible for the vehicle to run perfectly fine before turning the engine off. I have seen it happen and it took me quite a while to figure it out. I would never have thought it was the timing chain until I tried to move the distributor and it kind of started. Thats when I figured out that it was the timing chain. If your vehicle has a distributor, mark the position that its in now and then loosen the bolt holding it down and turn the distributor either way and see if it will start or want to start better. Or you can set your TDC on cylinder #1 and check where the position of the rotor is under the cap. theses procedures are a little easier than taking the timing cover off and checking it that way.
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to remove contaminated fuel , pull a fuel line of the fuel manifold and run the pump for a few seconds
not firing is sensor , immobilizer , ignition module problem but you stat that it fires on starter fluid so that cannot be right
starter fluid is a d good way of damaging the engine
a better way is to find and fix the fault
now to try and sort out what you are saying
it is cranking so the starter is good
it tries to run on starter fluid so there is spark to the plugs
it will not run and that indicates a lack of fuel to the injectors
a lack of fuel indicates
1--- a bad fuel pump
2--a vacuum in ht e fuel system from the tank not venting properly(EVAP system)
3--- fuel pressure regulator not working and providing pressure to the injectors
4--- bad injectors --- need cleaning
dump the starter fluid , buy a workshop manual and fix the problem properly
Do real fuel pressure test using test gauge. You changed ignition module but not coil? Are you getting nice fat blue spark? When spraying starter fluid into intake it only tries to start which makes me think you have ignition problem.
Usually because of an ignition or gas related problem. You need to check for spark at the plugs and for gas at the engine.
A quick method to check for a gas problem is to spray some starting fluid into the air intake on the throttle body. Take off the big boot from air filter housing to the engine, spray a shot of fluid into the engine, then try to start it. If it fires up and tries to run from the fluid for a few seconds, then you know it is a fuel problem. Maybe the fuel pump has quit working, or the fuel filter is clogged. If both are good, maybe a fuel injector circuit problem, less common but possible.
If nothing happens from the starting fluid, it may be ignition related-not getting spark. Pull off a spark plug wire from a spark plug and hold the plug wire end terminal about 1/4 inch from an engine bolt or ground. Have someone crank the engine over from the key and watch for a consistent, blue, snapping spark. If no spark, test a few other plug wires to verify no spark at all. So it is not just one ignition coil not working, but none of them produce spark. No spark means the ignition system needs diagnosing. Sometimes it is the ignition control module that goes bad-it can be tested at any parts store. Post back and we can go from there.
I would like you to verify spark. You can get a spark tester from a local part store for less than $10. Just pull the coil off of a spark plug, put the tester in the coil, ground the coil with the clip to a clean metal surface (preferably the block), and have someone try to start the engine. Only turn the key long enough to see if you have spark at the tester, shouldn't be more than a few seconds. If you have spark, put the coil back on the plug in the engine, spray some starting fluid in the air intake and see if the engine tries to start on the fluid. If it does, then we can be mostly certain you have a fuel issue. Let me know the results of the test. You can try spraying the starting fluid before you do the spark test. If the engine doesn't try to start on the fluid, then you need to do the spark test.
If there is no fuel pressure then its not getting fuel.If its not getting fuel, then getting spark is rare/.--------
So the problem relates to faulty fuel pump and clogged fuel filter.-------
It is possible that the fuel filter is clogged. If you're real careful you can inject a small amount of fuel in the air intake and see if the engine fires. (you can also spray starter fluid in the air-intake) If it does, you know you have a fuel issue; if it does not it could be an ignition issue. The air-intake is the best place to inject the fuel.----------Get the voltage checked at spark plugs and also check the coils.The spark plugs gets power to spark from coil pack.If the coils are faulty, the spark plugs will not spark.If coil is checked ok, then problem is spark plugs itself, causing the problem.---------It has to be replaced.This will help.Thanks.Helpmech.
You need fuel, air, and spark to start it. Make sure the engine is getting fuel. Make sure the pump is working. Fuel goes from the pump to the filter, through the lines, to the engine. If the engine is getting gas, you need to check for spark. This concerns the spark plugs/coils, wires, distributor, coil pack, dist.cap, rotor, cam sensor, crank sensor, timing belt, ecm. It is a lot of things but anyone of them can make the car not start. That is why it is important to do a fuel check and a spark check. If it gets fuel, that cancels out fuel. Same for the ignition system, where you get the spark. If you have any questions, just let me know.
Spray carb spray or starter fluid into intake hose then try to start. If starts then suspect fuel pump and or fuel pump relay. If does not start check spark. Pull off spark plug wire and ground to metal make sure no fuel is present and be careful not to spark yourself, crank car while grounding out wire if no spark suspect coil, fuse, ignition control module, crank sensor, wiring, or computer.