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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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.
Try spraying starting fluid into the intake. Remove the air filter to do this. If it starts for a few seconds then you have a fuel delivery problem. If it does not, then you have an electrical problem with the ignition. there are 3 things needed for an engine to run if it turns over. Air, Gas, Spark (fire). No air filter solved the easy air issue. Add starting fluid answers the fuel issue. Only leaves spark after that.
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.
check for spark at the plugs..if you have spark..get some auto mobile starter fluid ..spray some in engine intake.. if engine starts ..you have a fuel deltvery problem..that should narrow your your problem down..your fuel pump might be good..there are other parts in your system that will cause pump not to work.. such as plug fuel filter/pump relay..ecm..fuel pump fuse etc..take it one step at a time..guessing is costly
1.) put aside about $50 that you are ging to spend... period
2.) drain the oil and remove the old oil filter
3.) install a new oil filter, add new 30W oil
4.) remove all 8 spark plug wire from the 8 spark plugs
5.) remove the 8 spark plugs
6.) spray about 5 seconds of WD40 into each of 8 spark plug holes
7.) spray the remainder of the can into each of the 2 valve covers thru the EGR holes (pull out the EGR valve first)
8.) making certain that you have a full battery charge, turn the starter switch to START for about 5 seconds... if your engine turns then your internals are not frozen... that's good
9.) open another can of WD40 and spray equal amounts into ecah of 8 spark plug holes a second time
10.) turn the start switch on for another 5 seconds and listen for strange sounds... by the way without the spark plugs the engine will rotate more quickly than you normally expect... not a problem because as it turns it is lubricating your internal parts
11.) wait a minute and then turn it on for for about 10-20 seconds while listening for scraping or knocking sounds... if none heard then you are all lubed up and ready to reinstall the spark plugs.
Install new plugs or sandpaper the old with the correct gap ( I believe .035")
12.) if you didn't mark the plug wires not a problem... Google '78 Chevy Distributor Firing Order to find terminal #1 on the distributor cap... usually about the 1 o'clock position
13.) install #1 wire to #1 sparkplug... the driver's side front closest to the radiator
14.) the distributor rotates like a clock (clockwise) and the numbers on the clock starting at #1 is 1-8-4-3-6-5-7-2.... this is the firing order in a clockwise direction
15.) take the next plug wire #8 and connect it to #8 spark plug
Note: the spark plug numbers are cast into the top of the intake manifold for easier identification
16.) conect the remaining wires to their respective plugs
17.) make certain that you have a full battery charge, some gas in the tank (gas evaporates over 3 years) and a full radiator.
18.) Turn the starter switch and listen for the engine to start
19.) If it doesn't start the first time, try again and wait for the gas to reach the carburetor.... try again
20.) if it still doesn't start spray some engine strating fluid into the carbuetor throat and try again... it should start
21.) if it starts but doesn't keep running then repeat step 20. unitl the gas reaches the carburetor and continues to run on its own...!