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New engine and there is no spark from coil, no start

Tiny
RICHARD CHASTAIN
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 220,000 MILES
New engine install; no spark from coil. All coils test out well, crank sensor test out well. Everything works on car was driven into the garage. Nothing worse with new engine.
Wednesday, February 17th, 2021 AT 6:41 AM

34 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

The first thing that comes to mind when you say the engine is new, is a ground for the coil. Take a look at pic 1. The ground for the coil driver is on the right rear cylinder head. Check that and see if you have a good ground. Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

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

Take care and God Bless,

Joe
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Wednesday, February 17th, 2021 AT 6:47 PM
Tiny
RICHARD CHASTAIN
  • MEMBER
  • 1 POST
That got it. Thanks guys, you're awesome.
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Friday, February 19th, 2021 AT 1:57 PM
Tiny
DOLEARY6666
  • MEMBER
  • 6 POSTS
  • 1999 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
When it rains heavily my 99 tahoe won't start. I checked today and am not getting a spark. I have put in a new: distributor cap, rotor, plugs, wires 3-4 years ago(they look ok). Where do I look next? Only when it rains do I have this problem?
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Friday, February 19th, 2021 AT 2:00 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Pull coil wire see if spark is present. Fuel pump stay running?
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Friday, February 19th, 2021 AT 2:00 PM (Merged)
Tiny
DOLEARY6666
  • MEMBER
  • 6 POSTS
Yes,
I got a strong spark from the coil.
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Friday, February 19th, 2021 AT 2:00 PM (Merged)
Tiny
DOLEARY6666
  • MEMBER
  • 6 POSTS
The fuel pump comes on when I put the key in the on position and then shuts off. It sounds like it always has. I checked my fuel pressure and had 65lbs.
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Friday, February 19th, 2021 AT 2:00 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Let's try an experiment on a non rain day truck starting good spray water on the Cranksensor see diagram


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_399.jpg

. if good spray around DIST and coil see if you can make it fail then we'll no what to fix.
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Friday, February 19th, 2021 AT 2:00 PM (Merged)
Tiny
MARTINEZ 28
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET TAHOE
  • 0.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 275,000 MILES
No spark at the plugs?
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
This sounds like a classic crankshaft angle sensor here is a guide to help you get back on the road.

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Please let us know what you find.

Cheers

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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
MARTINEZ 28
  • MEMBER
  • 1 POST
Worked thanks!
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
BGBDWOLF
  • MEMBER
  • 12 POSTS
  • 1999 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 149,000 MILES
Car will not start. I got it in non-running condition. There is no spark from the distributor or coil. What coild be the most likely cause?
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuses underhood, crank and cam sensors and scan for codes. See if coil puts out to dist if it does may be rotor/cap problem.
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Also see if play in rotor if there is pull dist out and see if gear is torn up if it is replace dist.
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
BGBDWOLF
  • MEMBER
  • 12 POSTS
Checked all the fuses and relays. Have power to the coil but none going to the distributer. Checked the Cam sensor and it tested ok. Has new cap, rotor, plugs and wires.
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check where I've pointed to in pic see if pink wire leading to dist has power. If not check fuse 1 in underhood box and then see if it has power coming out of box it may be a poor connection in fuse box that powers the cam sensor in dist so car wold not run with no power to it. No codes I take it.
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
BGBDWOLF
  • MEMBER
  • 12 POSTS
I checked the wiring going to the coil and I have power going to the coil but none coming out. I bought a CP9125 OBD2 pocket scanner and it gave no codes. I checked the cam position sensor with the ohm setting on my voltage tester and it tested ok.
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
BGBDWOLF
  • MEMBER
  • 12 POSTS
I checked the pink wire going to the cam positioning sensor and I have 11.5 volts
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Is the coil putting any spark out at all? Also have your ignition control module checked autoparts can do t hat. It's on right side rear of engine by coil. Also check your crank sensor as those are the tow biggies for no starts and runs. You might try pulling crank sensor out and cleaning it sometimes that does it. Also check coolant sensor should have 5640 ohms at 50 degrees an d177 at 212 will be more the colder it is. Otherwise I dont' know what to tellyou.
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
BGBDWOLF
  • MEMBER
  • 12 POSTS
Tried checking the coil for spark by using the ol screwdriver trick and got no spark at all. Going to try replacing the coil and having the ignition controle module tested. Thanks for all your help so far. Atleast I know I am working in the right area to try and solve the problem.
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Monday, March 8th, 2021 AT 6:12 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Primary should be.1 ohms and secondary shold be 5000-25000 ohms.
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Monday, March 8th, 2021 AT 6:12 PM (Merged)

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