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2000 chevy c1500 with 4.3l has high fuel trim no codes

Just replaced the heads was clearing old codes and checking data noticed the fuel trim was 25%+ and idles rough runs fine at higher rpms

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  • billy reid Jan 21, 2013

    found that the intake plenum was leaking where the fuel injection harness went though it resealed and tested worked fine

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SOURCE: engine runs rough at certain speeds 3.0 v6 flex-fuel 1999 ranger

Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..

Posted on Nov 23, 2008

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SOURCE: 2002 Saturn idling high then drops to normal

Your 2002 Saturn car has an electrical recall .I think its the ignition modual.Owners should contact saturn @ 1-800-553-6000, Prompt 3
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Posted on Dec 16, 2008

redgto046m
  • 10 Answers

SOURCE: Runs rough at low rpms. Misfires but goes away at about 2000 rpm.

Sounds to me like it could be a Mass Airflow Sensor issue. Or Air fuel mixture problem. Is the harness to the MAF and Trottle control sensors hooked up right? These are just simple solutions that may work. Check all of your fuses as well. One could be blown causeing you DLC not to operate. DLC =DATA LINK CONNECTOR. Find the fuse... read the code.... solve them problem! GOOD LUCK! hope this helps.

Posted on Dec 28, 2008

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SOURCE: 99 chevy tracker is running very rough at idle

yes both of these items can cause your problems

Posted on May 17, 2009

dttech
  • 4803 Answers

SOURCE: misfire code, rough idle, full tune up complete,

The black soot on the plugs means that you are running extremely rich. The fuel injectors ma test good electricly, but they are notorious for leaks. The spider-looking thing sandwiched between the plastic intake plenum and the intake manifold gets cracks in it's "legs" and leaks fuel ito the plenum area. The fuel pressure regulator is also housed in this same assembly. if the diaphram in the regulator gets a pinhole in it, it also leaks fuel into the plenum area, causing all kinds of erratic idleing, black smoke from the exhaust, and will cause your fuel trims to drop into the negative 20s.

There is a technical service bulletin covering this subject. This procedure outlines the steps required to replace the existing Central SFI Fuel System with a new MFI (Multiport Flexible Injection) Fuel System.

It is removing the injectors which are all housed in the center body of the injector assembly and replacing them with a new version where the injectors are located where the ols "poppets" used to be in the intake manifold ports. The picture below is for a V-8 engine that is covered by the same TSB.052d4ba.gif
The poppets and the pressure regulator are available individually to fix your existing fuel injection system, but I gave up on that after replacing several poppets only to have them come back in a few months with another popet line broken. I recommend replacing the whole assembly with the new and improved version. My customers have told me after doing this that the engine never ran that smooth when it was new.

The GM part number for the new injector assembly for your V-6 engine is 12568332 it is also now available at several aftermarket parts outlets.

As for the timing chain solution posted by doodieman200, all I have to say is that I have enough fingers on one hand to count all of the failed timing chains I have replaced on these engines. If you don't have a cam/crank sync code, the timing chain has definitely not slipped a tooth.

Posted on Oct 18, 2009

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If Short term # is high while underway, but normal while idling, you could have a scewed maf signal. Sometimes cleaning maf with carb cleaner helps. If no intake leaks are found, and fuel pressure and volume are ok, it could be maf sensor.

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First of all, what kind of car is this? Second, this is a lean code. Now, if you really have no intake leaks or restricted fuel issues, one possibility is scewed maf signal during higher rpms. If you can, monitor your Short Term fuel trim at normal highway speeds.If it is high, then and lower at idle, you may need a maf sensor.
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