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1997 GMC truck issue. #4727912
04/15/18 02:32 PM
04/15/18 02:32 PM
Joined: Jun 2002
Posts: 2,047
southwest Mo.
wtd Offline OP
wtd  Offline OP
Joined: Jun 2002
Posts: 2,047
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


2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo
Re: 1997 GMC truck issue. [Re: wtd] #4727919
04/15/18 02:38 PM
04/15/18 02:38 PM
Joined: Sep 2015
Posts: 1,631
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,631
USA
Start with a compression test to check for mechanical damage.

Re: 1997 GMC truck issue. [Re: wtd] #4727929
04/15/18 02:44 PM
04/15/18 02:44 PM
Joined: Mar 2013
Posts: 5,124
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,124
The Midwest
It would nice if the damage was bent push rods.

https://www.amazon.com/ACDelco-19210687-...customerReviews


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: 1997 GMC truck issue. [Re: mk378] #4727932
04/15/18 02:47 PM
04/15/18 02:47 PM
Joined: Oct 2012
Posts: 2,488
Staten Island, NY
michaelluscher Offline
michaelluscher  Offline
Joined: Oct 2012
Posts: 2,488
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


'06 Toyota Camry SE V6 3MZ-FE 100k
'01 Mercury Villager Estate VG33E 52k
'06 Ford Taurus SE Vulcan 60k
'13 Chrysler 300 3.6 Pentastar 230k
Re: 1997 GMC truck issue. [Re: wtd] #4727944
04/15/18 02:55 PM
04/15/18 02:55 PM
Joined: Jun 2002
Posts: 2,047
southwest Mo.
wtd Offline OP
wtd  Offline OP
Joined: Jun 2002
Posts: 2,047
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


2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo
Re: 1997 GMC truck issue. [Re: wtd] #4727971
04/15/18 03:28 PM
04/15/18 03:28 PM
Joined: Sep 2013
Posts: 10,774
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,774
Indiana
This is just sad.

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


03 Jeep WJ 4.0 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: 1997 GMC truck issue. [Re: wtd] #4727988
04/15/18 03:39 PM
04/15/18 03:39 PM
Joined: Oct 2014
Posts: 12,709
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,709
Idaho
Get a new girl friend.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: 1997 GMC truck issue. [Re: wtd] #4728036
04/15/18 04:20 PM
04/15/18 04:20 PM
Joined: Jun 2009
Posts: 3,780
Chicago, IL
tomcat27 Offline
tomcat27  Offline
Joined: Jun 2009
Posts: 3,780
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.


2019 Cherokee, 2018 Jetta, 2014 Sentra, 1995 Escort, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300
Re: 1997 GMC truck issue. [Re: wtd] #4728051
04/15/18 04:33 PM
04/15/18 04:33 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Whatever it is, make the kid pay for it. It will keep the truck, but more importantly him, in better shape.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: 1997 GMC truck issue. [Re: dlundblad] #4728062
04/15/18 04:41 PM
04/15/18 04:41 PM
Joined: Jun 2002
Posts: 2,047
southwest Mo.
wtd Offline OP
wtd  Offline OP
Joined: Jun 2002
Posts: 2,047
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.


2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo
Re: 1997 GMC truck issue. [Re: Alex_V] #4728064
04/15/18 04:42 PM
04/15/18 04:42 PM
Joined: Jun 2002
Posts: 2,047
southwest Mo.
wtd Offline OP
wtd  Offline OP
Joined: Jun 2002
Posts: 2,047
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.


2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo
Re: 1997 GMC truck issue. [Re: wtd] #4728128
04/15/18 05:42 PM
04/15/18 05:42 PM
Joined: Feb 2013
Posts: 11,181
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,181
Phoenix, AZ
Do a compression test, as said above. Could be bent pushrods.


2015 Hyundai Sonata 2.4L 89k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 232k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 148k Mobil 1 HM 10w40 & Fram Ultra
Re: 1997 GMC truck issue. [Re: wtd] #4728174
04/15/18 06:22 PM
04/15/18 06:22 PM
Joined: Jul 2005
Posts: 10,194
Maricopa, Arizona
dave1251 Online happy
dave1251  Online Happy
Joined: Jul 2005
Posts: 10,194
Maricopa, Arizona
Try your best to ensure he pays for the repairs. This is all you can do.


make the inside of your engine oil cap white.
don't use.
Re: 1997 GMC truck issue. [Re: wtd] #4728186
04/15/18 06:35 PM
04/15/18 06:35 PM
Joined: Sep 2013
Posts: 10,774
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,774
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 202k Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: 1997 GMC truck issue. [Re: dlundblad] #4728191
04/15/18 06:38 PM
04/15/18 06:38 PM
Joined: Apr 2017
Posts: 1,603
San Rafael, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 1,603
San Rafael, 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.

Last edited by dogememe; 04/15/18 06:40 PM.

2010 Ford Escape 2.5 ~92K Miles: RP 5W-30, AMSOIL SS FE ATF.
1995 Chevy Silverado 5.7 ~277K Miles: Delo 10W-30, AMSOIL OE MV ATF.
AMSOIL in EVERYTHING!
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