Question about 1997 GMC Sierra

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My 350 ruins very rich hard to start, misses but runs good at full throtle

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Check engine (MIL) lamp illuminated ??
Code(s) present @ scan ??

Posted on Dec 11, 2014

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Posted on Jan 02, 2017

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2.3l 2001 ford ranger rough idle and running rich and misfiring with p0301 code


You have to correct the cylinder misfires first

You may have vacuum leaks somewhere in the
intake or exhaust

You really need to look at data with a scan tool

You start with Mode $06 & cylinder misfire count ,if that
even works well on your motor

Then you look at fuel trim & add short & long together,
to get an idea if it is running rich,which would be a lean
condition from a vacuum leak or rich from leaking injectors

All the data is only good if you haven't cleared it or disconnected
the battery. If you did, then you have to drive until all I/M Monitors
run & then look at data

You look at O2 sensor data & even scope them

You made no mention of checking for codes
No mention of a cylinder leak down test for valve leaks
Exhaust Converter age or condition !
Fuel Pressure !

Mar 05, 2014 | Ford Ranger Cars & Trucks

1 Answer

It is running rich. How do I adjust the carb?


You don't. First check air filter, if clogged, replace. Next, is your car throwing a trouble code? Try cleaning MAF sensor with carb cleaner (that's between air cleaner and throtle body), next, replace bank one of the oxygen sensor. I would start there. The problem running rich is a little generic, and the above are easy fixes. If this doesn't fix it, come back and we will move on to the next possible problem.

Apr 25, 2013 | 1994 Volkswagen Jetta

1 Answer

4.0L ford ranger runs rough misses under load, idles fine and under full throtle it runs with good power but when you try and go at a constant speed power dies off.. also on left side of engine all 3 plugs...


On the lean area look for a vacuum leak anything there,like PCV hoses and pull the plug on the EGR is there a difference?Is the valve hot at idle? Now check the rich side pull the hose off the fuel pressure regulator is gas leaking out? MAF cant do this, IAC cant do this ,TPS, If everything checks out no vauum no EGR leak No fuel regulator leak you may have to find out if the 02 sensor is reading the correct bank .Bank one could be on bank two, and bank two can be one bank one,It could be mismatched

Apr 30, 2011 | 1994 Ford Ranger Supercab

2 Answers

On normal acceleration the engine is running ok but on full throtle the engine in going up in RPM and explosion on the exhaust, no power,


Sounds like the car is 'running rich'

Take it to a garage to have the CO emmissions analysed. If it's backfiring, it's due to unburnt petrol ending up in the exhaust and the heat from the exhaust causing it to combust.

Jan 06, 2011 | 1999 Ford Escort

1 Answer

1998 saturn running rich seems to be getting to much fuel. What would cause this?


air intake sensor, throtle body sensor, throtle body, bad air filter, bad fuel filter, bad tempature sensor.

good luck let me know if you have any questions.


tepfy

Mar 15, 2009 | 1993 Saturn SL2

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