Thomas Steven Booth
New Member
- Joined
- Apr 3, 2016
- Messages
- 13
hey guys ive been having a real hard time pinpointing the source of a bad and inconsistent surge/missfire on my 87 ttype project. ive replaced plugs and wires, replaced the Ignition module, and coil pack just incase it had to do with ignition ( which i dont think it is ). replaced the fuel filter and i also swapped out my older fuel pressure regulator for a newer one not too long ago aswell.
fuel pressure is at 38-40psi at idle, and my voltage is reading 13.5 - 14, so all seems good there. checked and tweaked my TPS and my IAC to the right readings too because they were way off. ive basically done a good, and probably well needed spring cleaning on the car just trying to figure it out..
the car idles AMAZINGLY, but when I put it in gear and drive it around it'll sputter at any given time. it doesnt do it at any specific rpm. its completely random ( although it tends not to do it at low rpms when cruising around the block. but usually it happens when you give it gas, mabye 1/4 throttle or so. but like i said, not every time. its confusing... it'll even handle boost when it wants to, but rarely lets me climb to 5 psi before surging ). whenever this surge happens the car never dies completely, I take my foot off the gas and it cuts in and out for mabye 2 -3 secs, check engine light flashes on and off like mad. and sometimes even resets the computer whenever it happens. my scanmaster readings will flip out and give me a bunch of different error codes and then go back to 00 once its done having an aneurysm lol what is happening?!?!?!
could it be my fuel pump going out? i have an aftermarket high volume fuel pump ( hotwired ) that was put on years ago, not sure if that could be part of the problem. i really hope its not
i dont think its a vaccum problem either. ive replaced most of my vaccum lines, and the only bad ones i can tell are on the EGR, which i intend on deleting very soon.
my transmission is garbage but is still functioning, and is getting replaced soon as well, i dont think its got anything to do with that either but who knows.
any ideas? im at loss, ive been at it for some time now. i have a strong feeling its the fuel pump, but if theres anything else you can think of that can cause something like this to happen, let a brother know.
the engine only has 60k miles, and has been rebuilt once before, so i doubt its anything internal.
fuel pressure is at 38-40psi at idle, and my voltage is reading 13.5 - 14, so all seems good there. checked and tweaked my TPS and my IAC to the right readings too because they were way off. ive basically done a good, and probably well needed spring cleaning on the car just trying to figure it out..
the car idles AMAZINGLY, but when I put it in gear and drive it around it'll sputter at any given time. it doesnt do it at any specific rpm. its completely random ( although it tends not to do it at low rpms when cruising around the block. but usually it happens when you give it gas, mabye 1/4 throttle or so. but like i said, not every time. its confusing... it'll even handle boost when it wants to, but rarely lets me climb to 5 psi before surging ). whenever this surge happens the car never dies completely, I take my foot off the gas and it cuts in and out for mabye 2 -3 secs, check engine light flashes on and off like mad. and sometimes even resets the computer whenever it happens. my scanmaster readings will flip out and give me a bunch of different error codes and then go back to 00 once its done having an aneurysm lol what is happening?!?!?!
could it be my fuel pump going out? i have an aftermarket high volume fuel pump ( hotwired ) that was put on years ago, not sure if that could be part of the problem. i really hope its not
i dont think its a vaccum problem either. ive replaced most of my vaccum lines, and the only bad ones i can tell are on the EGR, which i intend on deleting very soon.
my transmission is garbage but is still functioning, and is getting replaced soon as well, i dont think its got anything to do with that either but who knows.
any ideas? im at loss, ive been at it for some time now. i have a strong feeling its the fuel pump, but if theres anything else you can think of that can cause something like this to happen, let a brother know.
the engine only has 60k miles, and has been rebuilt once before, so i doubt its anything internal.
