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73-87 Chevy _ GMC Trucks => Performance => Topic started by: Tazman on January 29, 2013, 05:59:20 PM
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Coming home on the freeway my acted like it was going againest very strong wind when the check engine light came on.Within a minute it was gone and running fine,yet did it again a little later.Then it got so bad I started losing speed and was pulling off to the side when it cleared up again and ran great the rest of the way home.Once home I checked the codes to find 33 (Map sensor high voltage) and 44(Lean exhaust.The map sensor was replaced a few months ago the only thing I can think of right away is I was under a quarter tank of gas and might have gotten some junk in the line.I will fill it with gas and try it again in the morning.It has a stock 350 with the TBI and a 700r tranny.Thanks
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Lean code?
Might be the fuel pressure regulator acting up. Other problem could be fuel pump. Do you have dual tanks? Does it do it on both tanks?
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Yes it has duals but I have never used the other side.The regulator and fuel pump have both been replaced less than a year ago.
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Check the fuel filter. TBI filters plug easily, because they have a fine micron rating.
Why did you replace the MAP sensor, fuel pump, and pressure regulator?