| Problem Diagnosis Got a problem you can't fix? Post here and one of our members will answer as soon as possible. |
10-17-2009, 08:23 PM
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#1
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AF Newbie
Join Date: Oct 2009
Location: lynchburg, Virginia
Posts: 1
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1992 jimmy problem HELP!!!!!!!!!
Got a 1992 jimmy with the 4.3L without vortec, its hard to start misses and you have to push the gas pedal down and hold it down until it warms up but once warmed up seems to run fine, has alot of gas smell to it. Changed plugs, wires, rotor button, dist. cap, oxygen sensor, MAF, and changed the oil and filter, none of it seems to help!!!! Anyone got any suggestions on what I need to do next, Thanks!!!
Last edited by rottiewoman24501; 10-17-2009 at 09:54 PM.
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10-18-2009, 11:17 AM
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#2
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AF - Advisor
Join Date: Sep 2005
Location: New London, Missouri
Posts: 13,262
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Re: 1992 jimmy problem HELP!!!!!!!!!
Quote:
Originally Posted by rottiewoman24501
Got a 1992 jimmy with the 4.3L without vortec, its hard to start misses and you have to push the gas pedal down and hold it down until it warms up but once warmed up seems to run fine, has alot of gas smell to it. Changed plugs, wires, rotor button, dist. cap, oxygen sensor, MAF, and changed the oil and filter, none of it seems to help!!!! Anyone got any suggestions on what I need to do next, Thanks!!!
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Any check engine lights or codes?
Computer check with a scanner on air tempt and engine tempt and TPS and map sensor to pcm readings would be a great help.
Any of them bad can cause rich running and starting problems.
__________________
Remember proper testing gives us the answer to many problems.
MT
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10-29-2009, 06:48 PM
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#3
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 1992 jimmy problem HELP!!!!!!!!!
possible cpi gone bad if it has it.
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.  
90 cav, 2.2 tbi, gas getter.
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10-30-2009, 12:17 PM
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#4
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The RustBuster
Join Date: Feb 2006
Location: La Plata, Maryland
Posts: 1,357
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Re: 1992 jimmy problem HELP!!!!!!!!!
Vortecs didn't arrive until 1996 model year along with OBD-II. You likely have a Throttle Body Injection (TBI).
Check these three things: 1) Idle Air Control (IAC) valve, 2) Exhaust Gas Recirculation (EGR) valve, and 3) Engine Coolant Temperature (ECT) sensor.
I'd also make sure you don't have any vacuum leaks...grab some carb cleaner and spray around the TB stack under the air cleaner. When the engine stumbles, where you sprayed is the leak.
Finally, make sure the coil is putting out a good hot-blue spark & test the resistance against the specs.
Hope this helps!
__________________
Current Garage:
2003 Pontiac Vibe 1.8L AWD
2003 GMC Envoy XL (aka "fat-a$$") - K&N air filter, otherwise stock.
1995 Chevrolet C2500 2wd, 5.7L - K&N air filter, otherwise stock...my weekend hauler.
1992 Toyota Camry LE 2.2L - K&N air filter.
Vehicle History:
2004 4.7L Dakota Quad Cab 4x4
1996 GMC Jimmy 4wd
1992 Chevrolet S10 Ext. Cab 4.3L
1995 Honda ST1100...my first (and only) new vehicle.
1980 Yamaha XS400
1980 Mercury Bobcat...my first car.
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10-30-2009, 11:01 PM
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#5
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AF Regular
Join Date: Feb 2008
Location: Annapolis, Maryland
Posts: 162
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Re: 1992 jimmy problem HELP!!!!!!!!!
Not to be nitpicky, but he said he didn't have Vortec, therefore he must have TBI.
However, most people call the CPI injection motor Vortec, since it says that on the top cover. That started in '92.
__________________
1993 Olds Bravada 4.3L CPI
1993 Chevy Astro EXT AWD 4.3L CPI (not a '94...oops)
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11-01-2009, 08:24 AM
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#6
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AF Newbie
Join Date: Jul 2003
Location: Bay City, Michigan
Posts: 63
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Re: 1992 jimmy problem HELP!!!!!!!!!
If the ignition timing was checked, you might want to verify that the connector for the wire you have to disconnect is re connected. (Under the dash on the right side behind the glove box).
Last edited by dracer398; 11-01-2009 at 08:25 AM.
Reason: typo
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11-01-2009, 09:10 PM
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#7
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AF Enthusiast
Join Date: Aug 2004
Location: westminster, Maryland
Posts: 649
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Re: 1992 jimmy problem HELP!!!!!!!!!
forgot to mention to check engine coolant temp sensor.
__________________
95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler split rear., 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.
71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.
90 cav, 2.2 tbi, gas getter.
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