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#1
02-26-2011, 07:58 PM
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confusion of a 99 chevy tahoe
I have a 99 chevy tahoe and it has a random multiple misfire code and a running rich code thrown everytime it has been diagnosed. we have replace nearly everything on the motor just short of replacing the whole engine. we are at a point of not knowing what could cause it to constantly run this way regardless of how much work is being done to it. Does anyone have any ideas what could cause these codes and what the resolution may be? The mechanics we have taken it to don't know what is wrong either. They replace parts they think it causing it to do this and it doesnt resolve anything. Does anyone know if it could be timing or the coil or what because it isnt throwing these codes but everything else has been replaced....
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#2
02-26-2011, 08:21 PM
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Re: confusion of a 99 chevy tahoe
1st of all, welcome to the AF.
2nd of all, you need to be very specific as to what parts have been replaced and what code numbers are showing up, both active & history. In order to try and help you we need the code numbers, not descriptions.
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57 Chevy 210 65 Olds 442 Convertible (Another one sold) 75 GMC Vandura 3/4 Ton 1999 K2500 Old Body Style Suburban (Gone but not forgotten) 05 Dodge Ram 3500/5.9 Cummins 2012 Toyota FJ Cruiser
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#3
02-26-2011, 08:26 PM
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Re: confusion of a 99 chevy tahoe
I assume you are getting a P0300- random misfire---I do know that cheap distributor caps will cause this--Thus, I only use OEM replacement parts- especially distributor caps and wires.....
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Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles-
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#4
02-27-2011, 12:12 PM
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Re: confusion of a 99 chevy tahoe
New- Central Sequential Fuel Injection Unit-
New rear breaks including hardware- New Master Cylinder New Camshaft Position Sensor New Crank-Shaft Position Sensor New MAP Sensor New Knock Sensor New Cap and Distributor New Water Pump New Intake Gasket New Plugs, Wires, Oil Change, Air Filter, Fuel Filter New Fuel Pump New Heater Switch New Aftermarket Exhaust I dont know the exact code # it just says multiple random misfire and fuel system running rich. It says to look for vacuum leaks but we cant locate any... Do you know where I could find an extensive vacuum diagram other than the one under the hood? Thanks for your knowledge
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