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1997 Saturn SL1 Error Codes P0300, PO122 & PO340 on 97

Tiny
RJP0205
  • MEMBER
  • 1997 SATURN SL1
  • 4 CYL
  • 2WD
  • MANUAL
  • 108,000 MILES
So, I have a 97 Saturn SL1. The check engine light came on about a month or so ago & the engine was running really rough with a high idle (2000+ rpms). I used my code reader & got codes P0301 (cylinder 1 misfire) & P0507 (high idle error). I had a mobile mechanic diagnose it as the intake manifold gasket & also said I needed a fuel injector (he said the cylinder 1 spark plug was not getting any fuel). Anyway, the mobile guy flaked on me so I took it into a shop & they fixed the intake manifold as well as replaced the radiator which was leaking. Unfortunately the check engine light is still on & is now throwing totally different codes PO300 (random cylinder misfire), P0122 (throttle position sensor) & P0340 (camshaft position sensor). What could possibly be wrong & why do I have all these new codes coming up? The guy at the shop seemed to think it was my ignition coil. I have replaced the plugs & wires btw. The engine is still running rough (tough to accelerate, not a lot of power) Any assistance is greatly appreciated
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Monday, March 22nd, 2010 AT 10:57 AM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Be sure everything is plugged in and clear the codes and drive it. See what comes back again, these will be hard codes.I have seen quite a few of those coils go bad, so it may very well be the problem. Try pulling the plugs (keep in order) to see if any one looks different than the others. If too dark it may be weak/no spark or if too light may be bad injector. Have also seen many CMP (Cam Sensors) go bad in those as well. Is it still idling too high?
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Tuesday, March 23rd, 2010 AT 7:41 AM
Tiny
RJP0205
  • MEMBER
  • 2 POSTS
Ok, what should I be looking for as far as things not being plugged in? I have pulled the spark plugs, they all looked about the same to me, although the mobile mechanic said cylinder 1 wasn't getting any fuel - would that more likely be an injector issue? It's idling fine now, the engine is still running rough & weak.
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Tuesday, March 23rd, 2010 AT 9:36 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
No fuel to a cylinder would be an injector issue. You may want to get a spark tester and compare spark to all cylinders, this will help to see if the coil is weak or shorting internally when the engine is hot or under load, when it is harder to burn the fuel. Be sure the TPS and CMP (cam pos sensor) are plugged in securely. Sometimes the connectors dont click all the way on
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Tuesday, March 23rd, 2010 AT 10:08 AM

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