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89 ford rangerboggs down when warm

I have a89 ford ranger with 2.9 v6 ..manual trans ..started out would only have problem once it got hot change head temp sensor didn't fix it.. now it will do it almost right away will idle fine but soon as you try to give more throttle like to pull out it will almost stall out.. pulled cat off thought it was clogged but still does same thing .with cat off thinking about replacing o2 sensor next ..any suggestions?

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  • 16 Answers

Any codes? fuel filter? or pump - think I would do a fuel pressure test on it first, then I would also towards the e g r valve, but would look at fuel first

Posted on Apr 20, 2014

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Posted on Jan 02, 2017

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SOURCE: engine stalls

your on the right route but also check egr valve

Posted on Jul 07, 2008

  • 59 Answers

SOURCE: 97 Ford Ranger 4.0L V6 Idles rough only when cold

Orand

Ther is a air Idle control valve located on the side of the throttle body. unplug it remove it spray it and clean it with carb cleaner replace it plug it back in and you will be a Happy person again.

Lugnut61

Posted on Feb 01, 2009

CMV9
  • 594 Answers

SOURCE: Pulled code p0420 on 99 chevy astro, 2wd, v6

from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

causes

A code P0420 may mean that one or more of the following has happened:

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
possible soloutions

Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


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Posted on Aug 20, 2009

  • 9 Answers

SOURCE: 2001 LINCOLN LS V6 - ROUGH IDLE / SOMETIMES STALLING.

Very common problem is about a dime size hole wearing in the rubber elbow on the PCV valve located on the driver side rear of the intake manifold.

Posted on Oct 13, 2009

  • 1 Answer

SOURCE: 1996 Dodge Ram 1500 4x4 5.2L engine. Truck stalls

Hi, I have the same problem, I'm sorry I can't help, but if you figure it out please let me know.

Posted on Jul 11, 2010

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