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I have a 2003 Astro w/4.3L. The vehicle service engine light flashes when I am driving uphill or with a load. The engine revs higher than normal (no tach) and with a significant loss of power. I can pull over and turn the ignition switch off and on. Immediately the light gies out and the van returns to normal drivability. The codes register PO101 and PO300, with sporadic 304, 306, 303.... I have changed the MAF twice since the repair shop thought the first replacement faulty. The dealership suggested sticking valve guides??? After receiving a ridiculous estimate from them, I went to a reputable machine shop which suggested the possibility of a bad crankshaft position sensor. I am getting ready to change these parts but am unsure if this will help. I haven't changed the cat yet because the exhaust shop didn't think the codes expressed a bad cat. Is there any way the injector could be involved as the cause? I know these vehicles have a history of troublesome injector units.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 625 Answers

SOURCE: 2001 Ford Explorer check engine light

fords have, very coming problems with vacium leaks, make sure to check the pcv hose assemvbly, one of the best ways to check it is to have it check with a smoke machine, but if you want to do it your self buy a carburetor clener and make sure it says flamable, the start the engine and spray litle by little all over the vacium hoses, if the rpm increases or drecrese by doing that, pay attention where are you spraying the fluid because you just found the leak

Posted on Aug 21, 2008

bunnydawg
  • 5158 Answers

SOURCE: Check engine light is on

no such thing as a catalytic computer... there is a catalytic converter ... part of the exhaust system so they may now be "guessing" that it's an O2 sensor. take the car to autozone... they will scan the codes for free.... post the codes here tho the lads and lasses there are pretty clever and will probably tell you what the codes mean.

Posted on Apr 16, 2009

  • 93 Answers

SOURCE: I have a 2001 Dodge Ram 1500 5.2L,

The plenum problem should not affect compression tests. It allows oil to get sucked into the intake and will cause carbon buildup, plug fouling, and pinging. If you have zero compression on a cylinder, it is usually a valve problem. Even a burned piston will make some compression, unless it has a big hole in the middle.
Sorry, but if your compression results are to be trusted (and it seems they are), then you have to tear a head off to find the problem, or at least get a borescope in it.

Posted on May 20, 2009

  • 51 Answers

SOURCE: 2003 Dodge Neon: P0016 (already replaced sensors, belt, tensioner

the computer may need to be reflashed. if it is running then it is not a bad sensor. either of those being bad would cause it not to run.

Posted on Aug 08, 2009

Keef2011
  • 160 Answers

SOURCE: 2002 PT Cruiser. Vehicle shut

This could be related to a loose camshaft drive belt. If you have slack in the belt the camshaft will rebound on over run causing the P0340. It can also be a Crackshaft sensor problem too.(P0335) Hope this helps...

Posted on Mar 06, 2011

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