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2003 dodge ram 1500 4.7l won't rev over 2900 rpms it acts like there is a restrictor in place I just replaced the coil packs and c code p 0128 shows up

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5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: dodge ram 1500 engine rpms surge at freeway speed

those sensors could cause the issue, clean the MAF 1st, also clean the idle system using the following procedure, the IAC can cause cruise surge. I use this to cure these problems all the time.

Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve (IAC) and throttle valve, they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Jan 13, 2009

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  • 1 Answer

SOURCE: remove front axle from differential on 2003 dodge ram

That works fine on a relatively new vehicle but one that has run in salt etc you'll save a lot of time if you remove the steering knuckle completey by separating lower ball joint and outer tie rod end ball joint and bring the whole steering knuckle to a bench to separate the hub/bearing. Soak everything with penetrant, loosen the bolts a few turns and try hitting right on the bolt heads. I also made a very sharp wedge from a chisel and rammed it hard on the other side to seoarate the hub. It will finally come apart then you'll see all the **** that was binding it due to an alumininum knuckle re-acting with a steel hub. Clean the hole and grease everything and fit new bearings

Posted on Feb 15, 2009

wracefans24
  • 1985 Answers

SOURCE: 01 dodge dekota 4.7L misfire on cylinder one only

depending on what kind of of scanner you used for codes,
cylinder #5,doesn't always mean cylinder #5,
it sometimes means the fifth cylinder in the firing order.
Chrysler's DRB scanner would give us the exact cylinder,
if you connect your scanner again see if you can watch the misfire counts happening,if you can pull a wire of off a different cylinder and see what cylinder the scanner calls it.

Posted on Dec 19, 2009

  • 736 Answers

SOURCE: My 2003 dodge ram 1500 shows dtc code P0420 can

PO420 code tells you the catalytic converter is not reaching the proper temperature .. that is measured by the back oxygen sensor (just behind the CAT ... make sure the heat shield is in place (in cold weather) .. you can check for a rattle in the cold CAT (thats bad) .. the rear O2 sensor can be bad or you could have a bad catalytic converter or one thats on it way to being bad .. there are some tests a mechanic can do .. 1. a back pressure test 2. measure the temperature of the CAT surface .. it should be around 225 deg F (after warmup) .. a non contact (IR) thermometer is handy for this .. make sure the pipe behind the CAT and the muffler are not leaking ..some "high flow rate " replacement mufflers will cause the trouble ..

Posted on Jul 02, 2010

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