Dan B.
04-13-2012, 04:21 PM
I have ALL sorts of issues but the ones I need SCS help with are pushrod 5.0L related!! :rolleyes:
Recently finished the HO conversion on my 1988 T-bird Sport Coupe. I put in a '88 Mustang GT motor, Explorer upper/lower intake, 70mm BBK TB/EGR, under drive pulleys, 1-5/8" shorties, 2.5" BBK offroad H, Flowmaster mufflers. Also used stock HO injectors (orange top) and a BBK FPR w/ gauge. The car also still runs SD w/ a DA9 computer and T5, I did not do the MAF conversion.
Here's the problems.
First....high idle. It hold steady at 1200rpm. Today I tore the intake off to search for vaccum leaks and found none....all the lines are either hooked up or plugged if not used. Also cleaned the TB, IAC and blocked off the EGR (it was in the way of the FP gauge). I adjusted the throttle screw and it did not help.
Second...it's got a sputter. When setting still at idle (1200rpm) it sounds like it has a miss. The FP is steady at 39#, drops to mid 30's when floored. When adding fuel and setting still (under no load) the sputter is mid-RPM (2500-ish) but floor it then it rips to 6K. The other sputter is driving....when accelerating smooth it goes along good. Floor it and the car goes flat, not fall on its face flat, but just does not go any faster. Back off the pedal a little bit and it picks up smooth.
I also tried to check the TPS voltage today. It was reading 1.7-1.9. I know it should be .98-.99. The idle is high and I don't know if this is leading to the high reading or what's going on. When I tried to adjust it, it only dropped to 1.6v.
When stopped on the road I can rev it up to 4K and side step the clutch...it will hone the tires and rev to 6K nicely till I lift or the car catches up to the tires. Occassionally when I do this and lift, it will pop back through the TB.
I think that is about all and I'm not leaving anything out.
Any ideas??? Looking for help here......want to get this thing going.
Recently finished the HO conversion on my 1988 T-bird Sport Coupe. I put in a '88 Mustang GT motor, Explorer upper/lower intake, 70mm BBK TB/EGR, under drive pulleys, 1-5/8" shorties, 2.5" BBK offroad H, Flowmaster mufflers. Also used stock HO injectors (orange top) and a BBK FPR w/ gauge. The car also still runs SD w/ a DA9 computer and T5, I did not do the MAF conversion.
Here's the problems.
First....high idle. It hold steady at 1200rpm. Today I tore the intake off to search for vaccum leaks and found none....all the lines are either hooked up or plugged if not used. Also cleaned the TB, IAC and blocked off the EGR (it was in the way of the FP gauge). I adjusted the throttle screw and it did not help.
Second...it's got a sputter. When setting still at idle (1200rpm) it sounds like it has a miss. The FP is steady at 39#, drops to mid 30's when floored. When adding fuel and setting still (under no load) the sputter is mid-RPM (2500-ish) but floor it then it rips to 6K. The other sputter is driving....when accelerating smooth it goes along good. Floor it and the car goes flat, not fall on its face flat, but just does not go any faster. Back off the pedal a little bit and it picks up smooth.
I also tried to check the TPS voltage today. It was reading 1.7-1.9. I know it should be .98-.99. The idle is high and I don't know if this is leading to the high reading or what's going on. When I tried to adjust it, it only dropped to 1.6v.
When stopped on the road I can rev it up to 4K and side step the clutch...it will hone the tires and rev to 6K nicely till I lift or the car catches up to the tires. Occassionally when I do this and lift, it will pop back through the TB.
I think that is about all and I'm not leaving anything out.
Any ideas??? Looking for help here......want to get this thing going.