1987 firebird 350, when cold, Can idle but u hit the gas and its as if your not even opening the throttle blades, Until it backfires threw the intake and starts revving up. DOES Not happen when warm, Does not happen with MAF unplugged, And when u hit the gas Generally even with it running rich and revving fine it has no power, or maybe the power of like 3 cylinders IMO

Its running PIG rich, No black smoke its just really rich because of the MAF unplugged most of the time because its a pain to let it warm up then plug it in Your gonna laugh when i tell you the HC from the emmissions test Sposed to be 2.00, IT got a 75. something

WHen i was at a garage the other day, I had the base timing set, BUt when i was there i also learned that I only had 4000 volts of spark going to cyn 6 +8, Causing a nice Misfire ( runs kinda rough) i replaced rotor + cap and wires are known to be good NOt sure if this could have anything to do with the backfiring? ALso replaced the 2 plugs in those cylinders thinking they were fouled

It has thrown a EST code in the past when we checked the codes, But what kept on popping up on the scanner was a 36? i think MAF burn-of relay almost immediality after you would clear the code

I replaced the Burn of with a known good relau and it still popped the code

Just looking for any ideas at all, im taking it back to my Shop on tuesday but would prefer to resolve this ASAP so i can have time to resolve other issues withing next week

Thanks guys

 

Nothing? Just started it today, Same symtoms until warm and even when warm doesnt rev quick, Takes a few seconds to catch up to the pedal

 

Just took it out for a cruise, Reset ecm and Only pops for about 2 mins then is fine, BUT falls on its face at 3000 rpm ODD i thought even for a tpi? Im thinking clogged cat atm, Ses light didnt come on either so i assume there isnt anything horribly wrong besides the misfires i have in 6 and 8

PLZ help me out, Thanks in advance

 

No ideas after 60 Veiws? Do i need to post any other information?

 

I had the same problem on my GTA, and the problem was the MAF itself...

 

Thanks for the Help, Gives me another idea as far as ive seen its the relays that do it but it could be te maf roasted, Ill Check it when it gets into shop on wens

 

On mine, as soon as I disconnected to MAF, it worked better but not as good as before, after changing the MAF itself, everything was back to normal...

 

any other ideas?

 

borrow a maf

 

Ill have to see about it, Not sure if autozone will let me try a new one out haha, And its mustang country out here, no thirdgens to borrow from

 

buy oen and if it dont wokr return it as not needed not used. thats if u got the cash to purchase up front of coarse.

 

Not sure i got the cash, lol what are they 160?