1999 Chevrolet Suburban cranks over, no start

MR GRUMPS

MEMBER
1999 CHEVROLET SUBURBAN
193,654 MILES

My truck ran fine one morning. Went home for couple hours then started truck no problem. Drove around corner (about 100ft)then truck shut off n won't start since. I just recently put in new fuel pump/filter, spark plugs /wires, distributor cap/rotor, control module and coil. It sounds like it wants to start but won't. I get no spark at #1 piston, good spark at #3 and weak spark at #5. What is causing this?

5 Replies

WRENCHTECH

MECHANIC
20,761 POSTS

What engine do you have?

Was this

answer

helpful?

Yes

No

Friday, October 4th, 2019 AT 3:45 PM

MR GRUMPS

MEMBER
4 POSTS

It's a 1999 Chevrolet suburban 1500 2wd w 5.7liter engine

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Friday, October 4th, 2019 AT 3:45 PM

WRENCHTECH

MECHANIC
20,761 POSTS

Having spark on some cylinders and not others is very odd. About the only place that can happen is the dist cap or wires. I would be more suspicious of the way you are testing. You should be using an adjustable spark tester so you can see how far the spark will jump.

Was this

answer

helpful?

Yes

No

Friday, October 4th, 2019 AT 3:45 PM

WRENCHTECH

MECHANIC
20,761 POSTS

You also want to see what the exact fuel pressure is. This engine is very pressure sensitive.

Was this

answer

helpful?

Yes

No

Friday, October 4th, 2019 AT 3:45 PM

MR GRUMPS

MEMBER
4 POSTS

Thanks, I'll check fuel pressure next. I'll get an adjustable spark tester n retest. I used the tester that lit up wen I tested. I'll get back to you asap. Thanks again for your input