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

Rough idle, but runs great at over 1500 rpm

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Old 03-16-2015, 12:41 PM
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Default Rough idle, but runs great at over 1500 rpm

Hello I'm a new diesel owner and PROUD to be Anyway my truck idles Rough, it's a 93 chev 6.2,, it's even rougher like say if I'm sitting at a red light I gotta put it in Nutruel just so it smoothens out. Any suggestions or cures?? I don't have a lot of cash to throw at it too, thanks
 
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Old 03-17-2015, 04:37 PM
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Originally Posted by BYRQN33
Hello I'm a new diesel owner and PROUD to be Anyway my truck idles Rough, it's a 93 chev 6.2,, it's even rougher like say if I'm sitting at a red light I gotta put it in Nutruel just so it smoothens out. Any suggestions or cures?? I don't have a lot of cash to throw at it too, thanks
More info on the truck is needed 1/2 ton or 3/4 ect vin code S or F, but it sounds like you have a injector not working start cracking injector lines one at a time the one that makes no difference is the culprit.

Oh and is the truck smoking ?
 

Last edited by Mayhem; 03-17-2015 at 04:39 PM.
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Old 03-17-2015, 07:54 PM
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Originally Posted by BYRQN33
Hello I'm a new diesel owner and PROUD to be Anyway my truck idles Rough, it's a 93 chev 6.2,, it's even rougher like say if I'm sitting at a red light I gotta put it in Nutruel just so it smoothens out. Any suggestions or cures?? I don't have a lot of cash to throw at it too, thanks
More info on the truck is needed 1/2 ton or 3/4 ect vin code S or F but sounds like you have a injector not working start cracking injector lines one at a time the one that makes no difference is the culprit.
 
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Old 03-18-2015, 03:21 PM
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Default Ecg valve? ?

Originally Posted by Mayhem
More info on the truck is needed 1/2 ton or 3/4 ect vin code S or F, but it sounds like you have a injector not working start cracking injector lines one at a time the one that makes no difference is the culprit.

Oh and is the truck smoking ?
Truck smokes at idle and lots driving off. Not too terribly but she smokes. I did crack every injector line but they all appear ok. Wondering could my ecg valve be the issue?
 
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Old 03-18-2015, 04:12 PM
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'93 6.2 model.?. Sounds like a fuel restriction. Check lift pump, fuel strainer, and fuel filter conditions....

6.2 Liter Diesel Engine

Added just in case its a typo
6.5 Liter Turbo Diesel Engine
 

Last edited by HeavyChevy95; 03-18-2015 at 04:21 PM.
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