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#1
11-13-2003, 12:37 PM
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4.3 rough idle
after startup engine either dies or idles rough. its gets better after warmup but doesnt go away.engine is 1991 with tbi.engine is new. new parts include tbi,egr,tps,iac,map,temp sensor, plugs,wires,dist,o2,and timings is set at 0 with pigtail unhooked. no codes come up i guess the computer is next unless someone knows different....
Last edited by kingmac12; 11-13-2003 at 02:41 PM. 
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#2
11-13-2003, 03:41 PM
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Re: 4.3 rough idle
Quote:
Low fuel pressure...below 9 psi will allow the engine to start but will not be enough fuel pressure to keep the engine running..especially cold. Also look closely at you vacum lines and check the intake manifold for vacum leaks...including the EGR valve
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#3
11-13-2003, 06:02 PM
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all new vaccum hoses,new fuel pump and shock screen have 12 psi fuel pressure with no vac. leaks detected. egr-ok. have noticed when you unplug the sensors and restart the engine it seams to idle ok at around 500 rpm,s as soon as you plug the sensors back in the problem returns. even after i reset the computer.
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#4
11-14-2003, 07:17 AM
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Re: 4.3 rough idle
Which sensor are you unpluging?
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#6
11-14-2003, 11:18 AM
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Re: 4.3 rough idle
Quote:
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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