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New Jasper 350 5.7k

TechShepp

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TechShepp New Member

TechShepp

Posted
Posted

History.. 1988 GMC G 2500 5.7K Full size Starcraft Conversion van.

Bought 2000 60,000 miles EXCELLENT....2008 125,000 BLOWN HEAD GASKET fixed; oil change...mechanic forgot to put oil in... A GMC 350 5.7K will go over 500 miles without oil before it blows...which it did.

 

New Jasper...NEW manifolds, injectors, egr, coolant temp sens. plugs and wires.

Manifolds on...off machined back on...lovely.

I DID NOT DO THE INSTALL...I paid for it....NOT PLEASED....

AND HAVE BEEN FIXING PROBLEMS MYSELF.

 

Problems...Van will start up idle fine then 50% of the time when the engine is up to temp and the idle kicks down the engine will surge...slightly...HAVE FOUND NO VACUM LEAKS YET...most drivers would probably not notice but it is driving me to drink and post here at 3:30am:) Stereo will work fine with van in park I engage tranny and move and she starts to short out on the right chnnl. At normal highway speeds or even street speeds... 25% of the time I hit the gas and the engine sounds like she is "missin" or the tranny is slipping...which I am sure it is not as that would have been DOA by now.

Plus she accelerates fine while sounding horrible when she does this so I doubt the tranny is the culprit.

 

I am thinking I have several problems...a bad ground and a bad plug or plug wire connection....

 

I am a touring Musician and can not have the van end up on the side of the road waiting for AAA....

 

What SHOULD have been a $$ saver has turned into being on the verge of a bad

move...

 

I am also an Audio/Electronic tech and have done a fair ammount of Auto repair..

 

This will go to a mechanic if I can't resolve the problems but I may end up sleeping in the shed if this costs any more big$$$$$$$$$$$$!!!:lol:

 

Any help would be DEEPLY APPRECIATED.

 

Thanks

pennzoil29 Senior Enthusiast

pennzoil29

Posted
Posted

The damn thing should've sounded like a time bomb without oil in it.

IMO, I would've bought a Crate engine, before ever considering a Jasper.

Mike G Enthusiast

Mike G

Posted
Posted

Did the same guy do the install that forgot the oil initially?

 

I agree that you are possibly looking for a bad ground. I had one in mine that was beating me up, that was the best $125 I spent to get that resolved (at a speedometer shop, that was my main clue). Becaue of all the electronics and plastic, they need the grounds. Start with the engine ground straps by the passenger side, and then look to the battery area. There were all kinds of divability issues that righted themselves with the ground fix. One other place to look may be your distributor, they have a tendancy to go bad too.

--Mike

Platonic Solid Enthusiast

Platonic Solid

Posted
Posted
... IMO, I would've bought a Crate engine, before ever considering a Jasper.

Woulda, Coulda, Shoulda . . .

Jasper makes high quality remanufactured engines and stands behind them. Plus they might even still be in buisness 3 years or 100,000 miles from now to honor that warrantee. :thumbs:

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