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Lou P.
Lou P., ASE Certified Technician
Category: Chevy
Satisfied Customers: 3721
Experience:  building and driving chevy's since i was in the womb!!!! camaro and corvette enthusiest, access to factory diagrams and tsb's
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My 1985 corvette starts fine and idles but when i give it gas

Customer Question

my 1985 corvette starts fine and idles but when i give it gas it bogs backfires .if i give it more pedal it revs and takes off till i let off pedal
Submitted: 7 months ago.
Category: Chevy
Expert:  Roy replied 7 months ago.
good afternoon my name is ***** ***** I will assist is this a carb on the engine???? Roy
Customer: replied 7 months ago.
its fuel injected
Expert:  Roy replied 7 months ago.
ok, first thing I would do is check the actual fuel pressure. you can rent a tester at a parts store to verify you have sufficient pressure Roy
Customer: replied 7 months ago.
ok
Customer: replied 7 months ago.
what should the pressure read and while car is running ??
Expert:  Roy replied 7 months ago.
key on engine off.... 40 lbs. I attached a list please dont forget to rate me as it is the only way I get paid for my efforts. the info I provide costs me personally to acquire for you. Roy
Customer: replied 7 months ago.
37-38 lbs is wat it read
Expert:  Roy replied 7 months ago.
ok, key on, engine off now start it and what is the pressure???
Customer: replied 7 months ago.
30 lbs
Expert:  Roy replied 7 months ago.
ok, that looks good. dont think you have an issue here. the next is timing. do you have a timing light to verify ignition timing??? Roy
Customer: replied 7 months ago.
what should it be timed at
Expert:  Roy replied 7 months ago.
attached chart for you to view. be sure it is in base timing mode. use a paper clip on the aldl connector upper 2 terminals to the right to put it in base timing Roy
Customer: replied 7 months ago.
timings
fine
Expert:  Roy replied 7 months ago.
what are the readings???
Customer: replied 7 months ago.
8 btdc
Expert:  Roy replied 7 months ago.
thats not what the chart said for the spec
Customer: replied 7 months ago.
have no chart
so wat does it say
Expert:  Roy replied 7 months ago.
sorry, I guess it did not send. I sent it again
Customer: replied 7 months ago.
dont understand it, whats that mean
Expert:  Roy replied 7 months ago.
you are checking the timing at the specific rpm listed. that tests the weights in the distributor as well. Roy
Customer: replied 7 months ago.
dont get it. 6 before tdc ???8 before tdc???? >>>>>?????
Expert:  Lou P. replied 7 months ago.
Hello I can help. the vette has 2 sensors that can cause this. The mass air flow and the throttle position sensor. Have you replaced any parts for this issue yet ?
Expert:  Lou P. replied 6 months ago.
Jerry, did you get the vette figured out?

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