Cranks but no start?

KEITHJARVIS2

MEMBER
1996 CHEVROLET TRUCK
200 MILES

New fuel pump, new injectors, new plugs, rebuilt engine timing seems to be on mark, fuel pressure great, spark good as well injectors working. Had it running for about 1 minute then quit. Now will not turn over wants too but nothing mass sensor showing. 2.44 g/ s plugged or unplugged.
any ideas?

4 Replies

JACOBANDNICKOLAS

MECHANIC
108,192 POSTS

Hi,

With the MAF unplugged, it should start if that was the issue. It will go into a predetermined setting to prevent the engine from turning off.

You have spark, fuel, rebuilt engine, so it should run. Actually, if you have spark, fuel, and compression, and the timing is correct, it doesn't have a choice but to run. So, one of those is missing.

Try this and let me know what happens. See if it starts with starting fluid. If it does and then stalls, we will know it is a fuel-related issue. If there is no change, we need to confirm you are getting a good, hot blue, snapping spark at the plugs. If that is present, check compression. If the timing is off, the compression may be too low for it to run.

Here is a link that explains how to test compression:

https://www.2carpros.com/articles/how-to-test-engine-compression

Let me know what you find or if you have other questions.

Take care,

Joe

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Sunday, November 13th, 2022 AT 6:09 PM

KEITHJARVIS2

MEMBER
1 POST

Thank you, Joe, for your information. It is helpful, I will test timing again and compression again as well as spark. I was told that without the MAF sensor plugged in it will not fire. Now I am a Ford mech and I found that I can unplug the MAF and the Fords I worked on. Will fire, could the MAF create this problem on the Chevrolet? It's baffling to me.

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Monday, November 14th, 2022 AT 4:03 PM

JACOBANDNICKOLAS

MECHANIC
108,192 POSTS

Hi,

It should start with the MAF disconnected. It may not run perfectly but it should run.

Let me know what you find. Also, if you can record it cranking and upload it for me to hear, it may help.

Let me know.

Take care,

Joe

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Monday, November 14th, 2022 AT 8:25 PM

KEITHJARVIS2