Question about Chevrolet Camaro

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I have a multiport fuel injection system in my boat that has the same computer as a 1991 chevy camaro. it surges or lags when i am trying to run at 3500 rpm's or above. and sometimes it just wont go above 2000 rpm,s. the fuel pressure is correct the fuel filter is new the cap and rotor is new the coil is new the relays are new

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  • rae41880 Jun 04, 2009

    my brother in law checked the fuel pressure and it stayed at 40 psi. how would i go about checking the fuel pump there is 2 a mechanical feeding the high pressure

  • rae41880 Jun 04, 2009

    the system runs in closed loop and doesnt have a o2 sensor because it is marine

  • rae41880 Jun 04, 2009

    the check engine light is off when the engine is running so there shouldnt be any codes

  • rae41880 Jun 04, 2009

    the timing is set right and the fuel pressure holds steady

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as you mentioned that ,it surges or lags when you are trying to run at 3500 rpm's or above and sometimes it just wont go above 2000 rpm,s this indicates. Vacuum leak, or faulty EGR valve.also  Check whatever has been worked on most recently. thanks. keep up dated

Posted on Jun 04, 2009

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What is the ignition timing set at?

Are there any codes in the computer? The ignition timing shud be at 10 degrees as specified by the Manufacturer sticker under the hood and and check if there are any codes from the CCC or ECM
also What is the o2 sensor volts when the engine is running like this? to check this Just back probe the signal wire with a paper clip and take a reading with your voltmeter. a steady reading from 0 to 1 volt shud be there
Check the o2 sensor voltage will tell us if the engine is running lean or rich. This way we will know which way to go.

Also, see if the fuel pressure holds steady after the fuel pump primes the fuel system. This is very important.
hope that helps.... if u found my service helpful... kindly rate my service thank you and have a nice day

Posted on Jun 04, 2009

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Hi there,

It seems like a weak fuel pump, so that sometime it miss the right rpm's.

Post further comment fo more help.
Thanks

Posted on Jun 04, 2009

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