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I have a 1998 5.7 Chevy 2500 truck. Original problem was a…

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I have a 1998...

I have a 1998 5.7 Chevy 2500 truck. Original problem was a bad valve. Replaced valve. Now I have a cam shaft/crank shaft correlation problem. I changed my distributor. Brought the truck to a Chevy dealer. He stated it could be timing chain and gears. He stated that the timin is off by 20 degrees. Did not solve the problem. The truck will run but if I line up the marks, the rotor is either in front or behind the number 8 on the distributor. The timing retard stats the the car is positive 30 degrees in one position and negative 23 degrees in the other position. I know that the timing needs to between 2 and negative 2 degrees. How can I get a half a tooth corrected

Mechanic's Assistant: How many miles on the car? How responsive has your car been lately?

146.000

Mechanic's Assistant: What year is your 2500?

1998

Mechanic's Assistant: Are you fixing your 2500 yourself? What have you tried so far?

Yes, everything above

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I do not think so

Submitted: 7 months ago.Category: Chevy
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Answered in 21 minutes by:
10/5/2017
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 30,179
Experience: GM Grand Master Technician 2007. 14 years experience.
Verified

Hi there, I am CAm.

Have you done any repairs to the distributor? Worn gear or shaft installed 180 from the gear have been known to cause this.

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Customer reply replied 7 months ago
Brand new factory distributor replaced from the dealer machanic and I even verified that is was in correctly with the 3 marks on the distributor.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

OK, and you cannot turn the distributor enough to compensate for its variance? Remember you need to shut it off, then start it and rev it over 1000 to update the reading each time.

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Customer reply replied 7 months ago
Correct, I have followed the directions that the. Truck needs to be over 1000 RPMs. And I have shut the car off and even unplug the battery to ensure fresh start.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

When move it only a bit. does it register ANY change in the reading?

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Customer reply replied 7 months ago
No. The rotor does not line up exactly on the number eight on the distributor. I can put the mark a little bit before or after the number eight mark on the distributor. The distribute it is off Buy a half a tooth. Either 22° negative or 29° positive. I've change the distributor the timing chain and gears. Could it be a cam shaft problem or a computer problem. This never happened until I blew a valve.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

Ok, lining it up on the 8 is only to get it on the correct tooth, and it should only line up with the 8 prior to dropping it in, after that it will rotate a bit off. Then you will turn the distributor like the old school systems to fine tune the adjustment.

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Customer reply replied 7 months ago
On a 1998 Chevy 5.7 is electric Timey the distributor is keyed and cannot be adjusted. I have tried adjusted it without the key no difference in the degrees it off.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

The 5.7Does allow fine tune adjustment. The distributor WILL turn, IF it will not then you have the incorrect distributor.

Advancing the timing is done electronically but the timing must be set, and while we call it timing, its actually correcting the Camshaft and crankshaft correlation. Cam sensor is in the distributor, crank sensor is under the front.

Attached you will find the GM document that outlines this.

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Customer reply replied 7 months ago
The distributor only move a hair and her only change it the most 2°
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

Then the hold down is wrong that holds the distributor in. It should be a tab that slides over and pushes down, Exactly like the older 350's.

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Customer reply replied 7 months ago
But when I move the The distributor. The retard does not change.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

Thats why you have to turn it off, then bring RPM over 1000 to update it.

It won't be a live reading.

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Customer reply replied 7 months ago
I do bring the car over 1000rpm to check for timing retard.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

Then I think your ECM may be the issue. It should recognize the change and update it. Have you changed it or had it updated?

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Customer reply replied 7 months ago
No I have not changed or updated it. I never had this problem until a broke a valve.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

Strange then. I have never had one do this.

But I still want to go back to the hold down, is it fixed solid on the distributor?

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Customer reply replied 7 months ago
Two pieces. Notch so it will not move. The original was the same too
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

Ok, this is very strange then. All I can think is the timing is off still, but why you cannot get it in check is new. Normally its a mechanical issue.

Did you have it lined up directly on the #8 cast into the lip with the bolt for the hold down lined up PRIOR to using the distributor in?
I know we are going back on this, but something simple seems to be off.

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Customer reply replied 7 months ago
It will not line up directly on the cast 8 it will be in front of it or behind it about an 1/2 inch. I feel this is my problem. Both timing heat are line up anTDC is lined up with the gears. This is the third distributor that has the same outcome. Why I think cam shaft got damaged from driving with a bad valve or computer. I can't get the distributor to line up exactly or over the cast 8.
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

Ok, but with the harmonic balancer lined up on the V and notch, it should.

I need you to tell me, you are not trying to get the 8 lined up AFTER it sits down in the bore?

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Customer reply replied 7 months ago
Then why does all the litature state that the rotor needs to line on the mark for 1 cylinder TDC?
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

The engine timing is #1 TDC on the crank, and by design, they have that cast 8 in the lip to get the proper gear tooth, so when you have it lined up, as you drop the distributor in, it rotates the the #1 TDC position when seated.

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Customer reply replied 7 months ago
What are reasons for it not to line up?
Chevy Mechanic: GM Tech (Cam), Chevy Technician replied 7 months ago

That I don't know. Every single one of these I have worked on, and the are MANY, I was able to rotate the distributor to adjust the timing as needed.

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