I have a 98 tahoe and I have so far reeplaced the o2 sensors and the coolent sensor and it still runs rich as a pig when you floor it it takes off like a rabbit .Let off the gas and back to rich ,if I run it on the highway after it cleans out it seems fine ,anybody have a suggestion?
98 tahoe runs super rich???
- Thread starter tahooe
- Start date
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You have some other diagnostic codes or sensor logs you would like to share? Fuel pressure readings? Have you looked up and studied the theory of operation of a MAF controlled fuel system? Searched this site for similar questions about similar issues? Or do you expect us to spoon feed you information based on some generic drivability issues and a couple of bad guesses?
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shorepatrol
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MAF clean, air filter
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Check engine light?
east302
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Code is p0304?
Try swapping the spark plug to a cylinder that is not showing a misfire and see if it follows to that one.
Check fuel pressure to rule out a fuel pump/regulator or leaking injector.
Have the plugs, wires, distributor or cap and rotor been replaced recently?
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Try swapping the spark plug to a cylinder that is not showing a misfire and see if it follows to that one.
Check fuel pressure to rule out a fuel pump/regulator or leaking injector.
Have the plugs, wires, distributor or cap and rotor been replaced recently?
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Coveman
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you know these vehicles are prone to the fuel regulator and spider leaking in the intake manifold? if you scan the truck and it is trying to lean the fuel trim substantially thats a pretty good sign that it is trying to compensate for all that extra fuel being dumped into the manifold. good idea to check the fuel line pressure which can help spot a leaker if the fuel pressure drops after you charge the system key on then off.
if thats the case this is a good time to r&r the regulator and spider with the California spider which may give you a nice bump in mpg.
if thats the case this is a good time to r&r the regulator and spider with the California spider which may give you a nice bump in mpg.
Eskimomann209
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Haha
What am I on Pirate4x4 or Gmt400?
Usually we don't talk to one another like this here
I have no patience for those that don't help themselves and yet become irritated or indignant when others don't come running to their aid. I would have left this one alone but for the second post. There are literally thousands of YouTube videos and websites (this one included) that have information about troubleshooting this type of issue, and all I see here is that there have been a couple of parts thrown at the problem with no effect, and then some whining.
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