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Thread Title:

1996 6.5 turbo kick in problem

Created On Monday July 22, 2002 16:29

Denlawn

Posts: 2
Joined: Jul 2002

Monday July 22, 2002 16:29

I've got a problem with my turbo engaging. recently went on a trip, the turbo haden't been kicking in at all, for quite some time, however on this trip, it did kick in a few times, maybe 5-6 times total (1200 mile trip ) but when it did engage, the rpm's were over 3000.
I've had this thing to a few different dealers, they say its right ! I know better.
Can anyone please help me out ?
Thanks,

Denlawn

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badges65

Posts: 132
Joined: Jul 2002

Monday July 22, 2002 18:13
that engine is rated up to 3600 RPM.. have you fitted a boost gauge?? what revs were you doing before the turbo kicked in?? was it on demand or just gradual increase of speed? what mileage has the engine done?? i would be looking at unbolting the turbo and get it checked don ------------------------- http://invertedvboats.741.com/

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Denlawn

Posts: 2
Joined: Jul 2002

Tuesday July 23, 2002 21:30

Don,
thanks for the reply.
the last dealer i went to said, i had proper boost, i'm not sure he really knew, as he didn't know what
pressure i needed when i asked.
As far as revs, i was pulling my camper, high profile 5th wheel. i would say i was demanding power.
milage is 52,000 , i've had this problem for 3 years.
the turbo was replaced 3 years ago, and has never worked properly.
I'm serious when I say, there is no one around here that knows how to fix it !
I need to find a mechanic that knows the 6.5
I'm located in north west Pa.

thanks,

Denlawn

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badges65

Posts: 132
Joined: Jul 2002

Wednesday July 24, 2002 00:21

Hi,
has this problem been since the turbo was replaced???????? if it has there is the problem. is it the right turbo???
I have posted this on my website forum may get someone who knows a bit more.
The service manual i have is for a 6.2 and doesnt show anything for a turbo so cant help much with boost pressure.
go to this site it may be of help to you ..
http://www.thedieselpage.com/
Went and reg. myself but still unable to get to forums even with a reply email and login so may take a while to get to them!!!!
don
have a peek at this site also may be of help..
http://www.bankspower.com/
another site you could look at ..
http://mywebpages.comcast.net/00gmc/index.html

don

-------------------------
http://invertedvboats.741.com/

Edited: Friday July 26, 2002 at 00:50 by badges65

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enginebuilder

Posts: 13
Joined: Aug 2002

Tuesday August 06, 2002 13:39

does it have an intercooler?, is it blocked?. does this eng: have E.G.R.? are the inlet or exhaust
manifolds partially blocked?.with turbo outlet pipe disconnected from inlet man: or intercooler can you feel any boost pressure?. with turbo outlet pipe disconnected from turbo and eng: off, does the shaft spin?. does shaft spin with eng: running can you see? use a mirror . is the turbo wastegate siezed.

Edited: Tuesday August 06, 2002 at 13:44 by enginebuilder

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ZTJ

Posts: 8
Joined: Aug 2002

Monday August 12, 2002 14:27

Hi.
I don't know if it is any help but i have some 6.5 ltr turbo diesels in my boat and i can tell that the charter pressure on theese engines must be between 60 and 170 Kpa. (app 0.6 - 1.7 bar). These engines has no "wastegate" to regulate the engine "suction pressure" it is done by a exhaust bypass valve ( bypasses some exhaustgas when the suctionpressure is too higt.) A pressure sensor on the intakemanifold tells the computer how high / low the suctionpressure is and the computer actuate an airactuator to the bypassvalve.
I think that your problem can be found around in this system.
A GM workshop can temp. put on a "mousetrap" on your engine and mesure the suction pressure during driving, and maybe you will see a drop in suctionpressure now and then.
Try WWW.dieselpump.com/chart_3.html
Do not try to block the exhaust bypassvalve mechanical in attemp to raise or stabilize your suctionpressure!!! it can destroy your pistons and bearings.

Best regard Torben :-)

-------------------------
torben.jespersen@mail.dk
Denmark

Edited: Monday August 12, 2002 at 15:40 by ZTJ

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