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Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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when i get up to around 55mph the truck starts bucking sort of and can't get past 55, once awhile i can get past it no problems but most of the time i can't. I've been told a need a new egr and it might ... JOIN NOW TO REMOVE TRACER

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  #1  
Old 11-30-2012, 01:54 PM
Diesel Fan

   

Default 6.5 blazer power problems

when i get up to around 55mph the truck starts bucking sort of and can't get past 55, once awhile i can get past it no problems but most of the time i can't. I've been told a need a new egr and it might be the problem, i want to make sure this is the problem before i spend 230$ on a new one. any help is appreciated

aayers's Sig:94 chevy blazer 6.5l td
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  #2  
Old 11-30-2012, 02:55 PM
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Make sure that the vacuum hoses are all connected properly no leaks

ClemstrucksRus's Sig:1976 DODGE W200 POWER WAGON

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  #3  
Old 11-30-2012, 03:56 PM
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i will. its getting worse, it stalled going up a hill and stalled when i hit 55 and had a really rough time starting again.
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  #4  
Old 11-30-2012, 06:53 PM
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With the truck safely parked and idling,open the water in fuel drain Tee-valve mounted near the thermostat housing and observe what happens.

If fuel flows and it keeps running-good.
If no fuel and it stalls-the Lift Pump is not working.
Could be a bad LP or a bad OPS.
To test the LP itself Apply 12 v to the ALDL pin G,the LP should run and pump fuel from power flow through the LP relay from ALDL pin G.
Or jumper the relay between the grey and orange wires(I think)the jumper locations are back middle and frt left on the relay connector.

If all is well there replace the OPS with AC Delco ONLY and google OPS relay mod.
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  #5  
Old 11-30-2012, 10:44 PM
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Do you know your rear axle gear ratio?

---AutoMerged DoublePost---

As for the stallinh id try what racer 55 has stated above

detroitdiesel idi's Sig:1992 c3500 chevy scottsdale 8 lug single cab long bed. Cummins conversion 95 12 valve and nv4500 both rebuilt by me.kdp fix crank sleeved rebuilt wh1c by me. 410 gears ac delco air shocks

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Last edited by detroitdiesel idi; 11-30-2012 at 10:44 PM.. Reason: Automerged Doublepost
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  #6  
Old 12-02-2012, 09:13 PM
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I'm really new to diesels. my mechanic said it could be the egr. if its not ill try what you've said, but it seems really over my head at the moment. new egr tomorrow hopefully. ops is oil pressure switch? my oil pressure has been normal even though i have had low oil and it stayed the same
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Old 12-02-2012, 09:19 PM
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Sounds like mechanic is new to these too...auto parts stores commonly mistake egrs for cdrs if u go to the store its under egr category but with 6.5s its cdr and is only oil pressure related dont believe itd affect power its located on passenger side up on valve cover looks like a can of chew it says notice tgis end up on the top of it
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Old 12-02-2012, 10:31 PM
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you will still read good oil pressure. the ops has a separate contact to power up the lp that is a weak point. i agree with racer55 i think it may be starving for fuel.
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  #9  
Old 12-03-2012, 07:07 AM
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the egr is not even connected. seems like you all think its the lp, i will see what i can do when i get home from work. would that be something thats expensive to replace or hard to install?
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  #10  
Old 12-03-2012, 08:39 AM
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think mine was about 70 for the lp and 30 for the ops. make sure you buy ac delco parts. the cheap aftermarket ops are junk. make sure and test both before you go throwing money at it. there are some informative threads on here on how to test them.

---AutoMerged DoublePost---

FYI if it is the lp get one for a 93'. i hear they carry the best fuel pressure.

Last edited by chrisa1995; 12-03-2012 at 08:39 AM.. Reason: Automerged Doublepost
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