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#4727912 - 04/15/18 03:32 PM 1997 GMC truck issue.
wtd Offline


Registered: 06/25/02
Posts: 1956
Loc: southwest Mo.
My fiance and her 15 year old son own this truck. It has 29,353 original miles on it and has the 5.7L vortec in it. It originally was my fiance's grandfather's truck and basically is was given to the 15 year old son.

The other day her son got the truck stuck in the field. He was with two of his friends and was told to leave the truck alone and his older brother was going to get another truck to get it out. Instead of listening, they ended up getting the truck out but now the engine is missing in cylinders 2 & 8.

Supposedly one of the friends got in the truck and revved the engine up to redline to get it out and who knows how many times this was done.

The plugs, wires, cap and rotor were all replaced about 2,000 miles ago. I pulled the plugs in those cylinders and they look fine with no obvious cracks or damage to the tips. I pulled the cap off and all of the contacts look fine as does the rotor tip.

I pulled the valve cover on that side to see if anything looked abnormal but every thing looked fine.

My fiance's father is a backyard mechanic and did some research and said he found information that states that if you over rev this engine, it will mess up the fuel injectors in the spider and says that we need to replace the fuel injection spider.

My question is, what other tests do we need to do to figure out why we have these misfires and has anyone else heard that over revving the engine will cause a fuel injection problem on this type of fuel system? Thanks.

Wayne
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#4727919 - 04/15/18 03:38 PM Re: 1997 GMC truck issue. [Re: wtd]
mk378 Offline


Registered: 09/27/15
Posts: 1449
Loc: USA
Start with a compression test to check for mechanical damage.

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#4727929 - 04/15/18 03:44 PM Re: 1997 GMC truck issue. [Re: wtd]
skyactiv Offline


Registered: 03/02/13
Posts: 4518
Loc: The Midwest
It would nice if the damage was bent push rods.

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#4727932 - 04/15/18 03:47 PM Re: 1997 GMC truck issue. [Re: mk378]
michaelluscher Offline


Registered: 10/07/12
Posts: 2439
Loc: Staten Island, NY
Originally Posted By: mk378
Start with a compression test to check for mechanical damage.


After that, see if it still has the original Poppet style CSFI spider unit on it

If it does, it may have just been it's time

Those style injectors get problematic with time

You can drop in a replacement updated MPFI style replacement
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#4727944 - 04/15/18 03:55 PM Re: 1997 GMC truck issue. [Re: wtd]
wtd Offline


Registered: 06/25/02
Posts: 1956
Loc: southwest Mo.
It does still have the original style CSFI system since it's low mileage. It was running fine prior to the over revving of the engine. The valve springs on those cylinders look fine. I guess we can pull the rocker arms to check to see if the push rods are bent. They don't appear bent but you can't see the entire rod with them installed.

I will do a compression test to see what it tells us. Thanks for the suggestions.

Wayne
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#4727971 - 04/15/18 04:28 PM Re: 1997 GMC truck issue. [Re: wtd]
dlundblad Offline


Registered: 09/30/13
Posts: 10205
Loc: Indiana
This is just sad.

The kid is going to destroy this thing have regrets the rest of his life after he grows up.
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#4727988 - 04/15/18 04:39 PM Re: 1997 GMC truck issue. [Re: wtd]
CT8 Offline


Registered: 10/09/14
Posts: 11239
Loc: Idaho
Get a new girl friend.
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#4728036 - 04/15/18 05:20 PM Re: 1997 GMC truck issue. [Re: wtd]
tomcat27 Offline


Registered: 06/25/09
Posts: 3596
Loc: Chicago, IL
as stated, check compression. at first I thought the fuel injection suggestion was crazy - until the spider was mentioned - then I recall some discussion with a mechanic friend on this.
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#4728051 - 04/15/18 05:33 PM Re: 1997 GMC truck issue. [Re: wtd]
Alex_V Offline


Registered: 04/10/16
Posts: 1174
Loc: Campbellsville, KY
Whatever it is, make the kid pay for it. It will keep the truck, but more importantly him, in better shape.
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#4728062 - 04/15/18 05:41 PM Re: 1997 GMC truck issue. [Re: dlundblad]
wtd Offline


Registered: 06/25/02
Posts: 1956
Loc: southwest Mo.
Originally Posted By: dlundblad
This is just sad.

The kid is going to destroy this thing have regrets the rest of his life after he grows up.


I doubt that since he doesn't appreciate much of anything. He doesn't even like the truck and wants one like his brother has which is a 2014 F150 crew cab 4x4.
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1998 Chevy K1500
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1970 Monte Carlo

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#4728064 - 04/15/18 05:42 PM Re: 1997 GMC truck issue. [Re: Alex_V]
wtd Offline


Registered: 06/25/02
Posts: 1956
Loc: southwest Mo.
Originally Posted By: Alex_V
Whatever it is, make the kid pay for it. It will keep the truck, but more importantly him, in better shape.


His mom has already told him he is paying for the repairs but even that doesn't seem to phase him.
_________________________
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1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo

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#4728128 - 04/15/18 06:42 PM Re: 1997 GMC truck issue. [Re: wtd]
Nick1994 Online   content


Registered: 02/19/13
Posts: 10312
Loc: Phoenix, AZ
Do a compression test, as said above. Could be bent pushrods.
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#4728174 - 04/15/18 07:22 PM Re: 1997 GMC truck issue. [Re: wtd]
dave1251 Offline


Registered: 07/15/05
Posts: 8698
Loc: Maricopa, AZ
Try your best to ensure he pays for the repairs. This is all you can do.
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#4728186 - 04/15/18 07:35 PM Re: 1997 GMC truck issue. [Re: wtd]
dlundblad Offline


Registered: 09/30/13
Posts: 10205
Loc: Indiana
Originally Posted By: wtd
Originally Posted By: dlundblad
This is just sad.

The kid is going to destroy this thing have regrets the rest of his life after he grows up.


I doubt that since he doesn't appreciate much of anything. He doesn't even like the truck and wants one like his brother has which is a 2014 F150 crew cab 4x4.


You have my condolences. He sounds like a real winner.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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#4728191 - 04/15/18 07:38 PM Re: 1997 GMC truck issue. [Re: dlundblad]
dogememe Offline


Registered: 04/15/17
Posts: 720
Loc: SF BAY AREA, CA
Originally Posted By: dlundblad
This is just sad.

The kid is going to destroy this thing have regrets the rest of his life after he grows up.


yeah, screw this, have the kid use his own money to pay a shop to diagnose and fix it. otherwise, the learning will never occur. can't afford it? no problem, truck stays parked. i would be much more appreciate of a beautiful low mileage gmt400 than this brat.


Edited by dogememe (04/15/18 07:40 PM)
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