engine trouble please help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bakerboys · 11-27-2011, 11:29 PM

have a 1993 gmc jimmy

It idles real rough untill warmed up then it runs better but no service engine light is on still does not have a lot of power but i am use to v8 but my sons 4.0 cherokee has alot more power it has 4.3 vortec
while driving down road it runs fine just idles bad until warmed up any help is great thanks

Tink · 12-01-2011, 04:44 PM

Is this a CPI or TBI? The CPI motors are great and have good power, but they have their own special set of issues....

bakerboys · 12-01-2011, 05:15 PM

Tpi
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bakerboys · 12-01-2011, 05:16 PM

I know its not the inject spiders they are new
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bakerboys · 12-02-2011, 06:26 PM

ok update no.6 spark plug if firing and plug has lot of fuel on it

unplug the no.6 spark plug wire and no ch cyange to engine its running on 5 cylinders but i am getting spark and fuel and we did not find any vacume leaks anyone help me

68C15 · 12-04-2011, 07:57 AM

first we need to clarify which engine you have. 1993 would either be a TBI (throttle body injection) with the 8th digit of VIN being a "Z" or the "vortec" CPI (central port injection) with the 8th being a "W".

the CPI "W" engine having poor running/long cranking time/wet plug on #6 is usually a sign of the plastic fuel lines under the upper intake leaking since they sit right above the entrance to the intake runners for #4 and #6. you can verify this by removing the plastic cover on top of engine (2 T30 screws) and the Intake Manifold Tuning Valve. the have someone turn the key to run while you look through that opening towards the back drivers side corner with a small flashlight.
the lines are available aftermarket
http://dormanproducts.com/p-3431-551...ector%2520Line

68C15 · 12-04-2011, 08:05 AM

I should add though that lately I have little or no faith in Dorman stuff.

bakerboys · 12-04-2011, 10:45 AM

sorry yes it is cpi

BarryB · 12-05-2011, 11:23 AM

Have you done a compression test? Just to help eliminate other problems?

bakerboys · 12-10-2011, 11:41 PM

ok guy lied he never replaced spyder injector i did it today one side was a lot cleaner than other side it has good compression to

it runs alot better but still seems to have a small miss

bakerboys · 12-19-2011, 02:07 AM

Huh
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Tink · 12-26-2011, 11:01 AM

Spammer...

Is the #6 still not firing?

bakerboys · 12-26-2011, 11:09 AM

I dont think so hard to tell runs better now but still missing
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11-27-2011, 11:29 PM	#1
bakerboys Registered User Join Date: Aug 2010 Location: Pikeville NC Posts: 239	engine trouble please help have a 1993 gmc jimmy It idles real rough untill warmed up then it runs better but no service engine light is on still does not have a lot of power but i am use to v8 but my sons 4.0 cherokee has alot more power it has 4.3 vortec while driving down road it runs fine just idles bad until warmed up any help is great thanks

12-01-2011, 04:44 PM	#2
Tink Registered User Join Date: May 2002 Location: VA Posts: 1,337	Re: engine trouble please help Is this a CPI or TBI? The CPI motors are great and have good power, but they have their own special set of issues.... __________________ 69 Chevy C10 88 Sierra 02 2500 Suburban And too many S10s to list!

12-01-2011, 05:15 PM	#3
bakerboys Registered User Join Date: Aug 2010 Location: Pikeville NC Posts: 239	Re: engine trouble please help Tpi Posted via Mobile Device

12-02-2011, 06:26 PM	#5
bakerboys Registered User Join Date: Aug 2010 Location: Pikeville NC Posts: 239	Re: engine trouble please help ok update no.6 spark plug if firing and plug has lot of fuel on it unplug the no.6 spark plug wire and no ch cyange to engine its running on 5 cylinders but i am getting spark and fuel and we did not find any vacume leaks anyone help me

12-04-2011, 08:05 AM	#7
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: engine trouble please help I should add though that lately I have little or no faith in Dorman stuff. __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

12-01-2011, 05:16 PM	#4
bakerboys Registered User Join Date: Aug 2010 Location: Pikeville NC Posts: 239	Re: engine trouble please help I know its not the inject spiders they are new Posted via Mobile Device

12-04-2011, 07:57 AM	#6
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: engine trouble please help first we need to clarify which engine you have. 1993 would either be a TBI (throttle body injection) with the 8th digit of VIN being a "Z" or the "vortec" CPI (central port injection) with the 8th being a "W". the CPI "W" engine having poor running/long cranking time/wet plug on #6 is usually a sign of the plastic fuel lines under the upper intake leaking since they sit right above the entrance to the intake runners for #4 and #6. you can verify this by removing the plastic cover on top of engine (2 T30 screws) and the Intake Manifold Tuning Valve. the have someone turn the key to run while you look through that opening towards the back drivers side corner with a small flashlight. the lines are available aftermarket http://dormanproducts.com/p-3431-551...ector%2520Line __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

12-04-2011, 10:45 AM	#8
bakerboys Registered User Join Date: Aug 2010 Location: Pikeville NC Posts: 239	Re: engine trouble please help sorry yes it is cpi

12-05-2011, 11:23 AM	#9
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: engine trouble please help Have you done a compression test? Just to help eliminate other problems? __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff!

12-10-2011, 11:41 PM	#10
bakerboys Registered User Join Date: Aug 2010 Location: Pikeville NC Posts: 239	Re: engine trouble please help ok guy lied he never replaced spyder injector i did it today one side was a lot cleaner than other side it has good compression to it runs alot better but still seems to have a small miss

12-19-2011, 02:07 AM	#11
bakerboys Registered User Join Date: Aug 2010 Location: Pikeville NC Posts: 239	Re: engine trouble please help Huh Posted via Mobile Device

12-26-2011, 11:01 AM	#12
Tink Registered User Join Date: May 2002 Location: VA Posts: 1,337	Re: engine trouble please help Spammer... Is the #6 still not firing? __________________ 69 Chevy C10 88 Sierra 02 2500 Suburban And too many S10s to list!

12-26-2011, 11:09 AM	#13
bakerboys Registered User Join Date: Aug 2010 Location: Pikeville NC Posts: 239	Re: engine trouble please help I dont think so hard to tell runs better now but still missing Posted via Mobile Device



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