efi foxbody owners downriver...
- Thread starter dudek
- Start date
Billydroveit
Club Member
In all Gears? What mods have you done? Any ignition upgrades, what plugs, something new that started since changing something, or just something started with a known good combo?
well
the car was a known good combo for a couple days of being fresh a fresh h/c/i combo, i cant recall if i made any particular changes...its a long story to say the least.
in 1 or 2nd if you run it out real slow to 6k rpm its fine..(havnt been able to run out 3rd gear slow) , anytime you mash on the gas itll get to 4.5k/5k rpm and start breaking up and popping.
ignition is stock with tr55 plugs that have less then 300miles on em same with the plug wires
fuel pressure is 42ish
ive tried a different ignition coil as well as ignition module with no fix
ive tried turning down the timing with no fix
my test on the maf showed it was off on voltages, ie 1v at idle and its supposed to be around .6vs
my thinking is either
maf
pip sensor (distributor)
or valve float
the car was a known good combo for a couple days of being fresh a fresh h/c/i combo, i cant recall if i made any particular changes...its a long story to say the least.
in 1 or 2nd if you run it out real slow to 6k rpm its fine..(havnt been able to run out 3rd gear slow) , anytime you mash on the gas itll get to 4.5k/5k rpm and start breaking up and popping.
ignition is stock with tr55 plugs that have less then 300miles on em same with the plug wires
fuel pressure is 42ish
ive tried a different ignition coil as well as ignition module with no fix
ive tried turning down the timing with no fix
my test on the maf showed it was off on voltages, ie 1v at idle and its supposed to be around .6vs
my thinking is either
maf
pip sensor (distributor)
or valve float
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Billydroveit
Club Member
Valve float is valve float, it doesn't care how you get to an RMP if it's gonna float it will. I would suspect something in ignition...what do the plugs show? Are you sure that's the right plug for the head (reach and seat)? What voltage are you getting at the TPS? Kinda sounds ignition related. How old is the coil? Had an accel coil do all this to me once!
agreed on the valve float, ive beleived it to be something ignition myself but research ive done is throwing different ideas around in my head
seeing it was ran good before, i would say its the right plug (gt40p heads)
the plugs actually look pretty good, nothing to where id be concerned of a missfire there.
ill double check the tps voltage and try this other coil i have.
the pip sensor is still singing to me as well as the mass tho
seeing it was ran good before, i would say its the right plug (gt40p heads)
the plugs actually look pretty good, nothing to where id be concerned of a missfire there.
ill double check the tps voltage and try this other coil i have.
the pip sensor is still singing to me as well as the mass tho
Billydroveit
Club Member
Make sure TPS voltage is good through WOT and it's smooth no glitch spots. You can find the voltages on teh web somewhere, been a while but i think i found them on corral.net...i googled to find it.
WHat is a PIP sensor, don't think i've ever heard that term?
WHat is a PIP sensor, don't think i've ever heard that term?
tps voltages were a bit low, i fixed that with no success.
changed to the other ignition coil and still nothing
the pip is the magnetic pick up sensor inside the distributor.
i guess an easy way to figure out if its the distributor or not is taking a known good distributor
and go from there.
gotta efi distrib? lol
changed to the other ignition coil and still nothing
the pip is the magnetic pick up sensor inside the distributor.
i guess an easy way to figure out if its the distributor or not is taking a known good distributor
and go from there.
gotta efi distrib? lol
Billydroveit
Club Member
OK never heard it called PIP That could be the only thing left i could think of unless there's some restriction in your fuel system.
I might have a the one off the car we took apart..lemme check.
Billydroveit
Club Member
I'm not an expert but i'll try and asnwer this. The heavier you are on teh accelerator the more is required from teh ignition system. Creaping up to that RPM is easier on the system than to smash the gas to the wood. At WOT there's more cylinder pressure, and fuel to burn, thus asking for more from the ignition. Although i'm not sure how that transfers to the pickup, but only one way to tell...swap it out
Billydroveit
Club Member
I think i have one won't know for sure till after work. You can call Jay (from the for sale thread i showed you) after 3:45 he said if he has it 30 and it's yours.
EDIT: He called me, he has the dizzy...
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pretty much what billy said, altho with my thinking in it, if i start spinning the motor faster to 5,500 rpm the pick up in it isnt catching it, but slow rpm it is catching it. im just trying to find a few known good parts that are easy to swap to try to help narrow down what my problem could be because these efis can be a nightmare sometimes...
and thanks billy
ill have to give him a call.
Billydroveit
Club Member
No problem...wish i could help more.
surely appreciate it,
wish ya could help too!
for all i know its something stupid that im over looking because im the only person working on the car! lol
Billydroveit
Club Member
I hate it when that happens!
your telling me!
i appreciate the offer
problem ended up being the distributor, weather it was the tfi module or pip sensor i dont know yet, but bought another one for 30 bucks today, installed and the car has been running great since!
also thanks again billy for the help and the lead on the distributor that saved me some more stress! lol
