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1997 GMC truck issue. #4727912
04/15/18 03:32 PM
04/15/18 03:32 PM
Joined: Jun 2002
Posts: 2,026
southwest Mo.
wtd Offline OP
wtd  Offline OP
Joined: Jun 2002
Posts: 2,026
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 03:38 PM
04/15/18 03:38 PM
Joined: Sep 2015
Posts: 1,553
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,553
USA
Start with a compression test to check for mechanical damage.

Re: 1997 GMC truck issue. [Re: wtd] #4727929
04/15/18 03:44 PM
04/15/18 03:44 PM
Joined: Mar 2013
Posts: 4,870
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 4,870
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
Re: 1997 GMC truck issue. [Re: mk378] #4727932
04/15/18 03:47 PM
04/15/18 03:47 PM
Joined: Oct 2012
Posts: 2,467
Staten Island, NY
michaelluscher Offline
michaelluscher  Offline
Joined: Oct 2012
Posts: 2,467
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 03:55 PM
04/15/18 03:55 PM
Joined: Jun 2002
Posts: 2,026
southwest Mo.
wtd Offline OP
wtd  Offline OP
Joined: Jun 2002
Posts: 2,026
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 04:28 PM
04/15/18 04:28 PM
Joined: Sep 2013
Posts: 10,537
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,537
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 200k 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

Re: 1997 GMC truck issue. [Re: wtd] #4727988
04/15/18 04:39 PM
04/15/18 04:39 PM
Joined: Oct 2014
Posts: 12,042
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,042
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 05:20 PM
04/15/18 05:20 PM
Joined: Jun 2009
Posts: 3,719
Chicago, IL
tomcat27 Offline
tomcat27  Offline
Joined: Jun 2009
Posts: 3,719
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, 2015 Rogue, 2014 Sentra, 2001 Camry, 2005 Starcraft, 1998 Dodge B1500
1996 Sebring Jx, 1984 F150, 1970 Cougar, 2013 XT250, 2010 Vstar, 2014 CTX1300
Re: 1997 GMC truck issue. [Re: wtd] #4728051
04/15/18 05:33 PM
04/15/18 05:33 PM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Whatever it is, make the kid pay for it. It will keep the truck, but more importantly him, in better shape.


I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K
Re: 1997 GMC truck issue. [Re: dlundblad] #4728062
04/15/18 05:41 PM
04/15/18 05:41 PM
Joined: Jun 2002
Posts: 2,026
southwest Mo.
wtd Offline OP
wtd  Offline OP
Joined: Jun 2002
Posts: 2,026
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 05:42 PM
04/15/18 05:42 PM
Joined: Jun 2002
Posts: 2,026
southwest Mo.
wtd Offline OP
wtd  Offline OP
Joined: Jun 2002
Posts: 2,026
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 06:42 PM
04/15/18 06:42 PM
Joined: Feb 2013
Posts: 10,893
Phoenix, AZ
Nick1994 Online content
Nick1994  Online Content
Joined: Feb 2013
Posts: 10,893
Phoenix, AZ
Do a compression test, as said above. Could be bent pushrods.


2015 Hyundai Sonata 2.4L 86k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: 1997 GMC truck issue. [Re: wtd] #4728174
04/15/18 07:22 PM
04/15/18 07:22 PM
Joined: Jul 2005
Posts: 9,131
Maricopa, AZ
dave1251 Online happy
dave1251  Online Happy
Joined: Jul 2005
Posts: 9,131
Maricopa, AZ
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 07:35 PM
04/15/18 07:35 PM
Joined: Sep 2013
Posts: 10,537
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,537
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 200k 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

Re: 1997 GMC truck issue. [Re: dlundblad] #4728191
04/15/18 07:38 PM
04/15/18 07:38 PM
Joined: Apr 2017
Posts: 1,172
SF BAY AREA, CA
dogememe Online content
dogememe  Online Content
Joined: Apr 2017
Posts: 1,172
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.

Last edited by dogememe; 04/15/18 07:40 PM.

2010 Ford Escape FWD 2.5 ~90K Miles
Currently: Royal Purple 5W-30, Wix 51348
I prefer Royal Purple, Valvoline, Castrol, and O'Reilly oils.
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