I have a '94 GT 5 spd with a few mods and I am having a couple really nerve-racking issues that I hope I can explain clearly enough to have some light shed on by my fellow stangnetters...
'94 GT (Caroline)
-----------------------------------------
'89 GT motor - new rings, new bearings, new HV oil pump & pick up, new timing set, ARP head bolts...
GT40 3-bar heads
CraneCams F3ZE 1.7 roller rockers
B-303
ProComp upper & lower intakes
Edelbrock intake adapter elbow
stock TB
Cold Air Intake (fenderwell pick up)
BBK Equal-Length shorty headers
BBK X-pipe
40 series Flows w/ turndowns
Steeda Progressive Rate Lowering Springs
All new shocks, struts, bushings, ball joints, etc...
18"x9"/18"x10.5" FR500 wheels (245/45/18 Front & 285/45/18 Rear)
3.73 gears
I rebuilt the motor myself and she runs like a top. I bought Caroline with her stock engine in fine working order; I had built this new engine for my Mark VII LSC. She runs great, but anywhere under 1800rpm, she chugs so badly and starts to buck. I immediately have to downshift to bring the rpm up to what she likes and then she runs great.
I don't understand why with the B cam and the 3.73's she runs like this... Is there too much duration for the gear or too much gear for the lift? Is the engine pulling in too much air with the CAI, larger intakes, and GT40's that the stock 19# injectors aren't supplying enough fuel? IS it a combination of the two?
This engine has always done this in this car. Last week I started running only NON-ethanol fuel and while it seemed to make her run considerably better, she still chugs...
The other problem I am having is when driving, either accelerating or maintaining speed, you hear this bub...bub..bub...........buh-bub...through the exhaust and you can feel it, almost like a miss... I have new '93 cobra spark plugs (to match the GT40 head/plug specs), maybe it's the wires? Or maybe the coil isn't as strong as the engine needs, just like the injectors...?
Help!!! Please let me know what you think. I am trying to narrow down my next move... This feels like a game of chess...
'94 GT (Caroline)
-----------------------------------------
'89 GT motor - new rings, new bearings, new HV oil pump & pick up, new timing set, ARP head bolts...
GT40 3-bar heads
CraneCams F3ZE 1.7 roller rockers
B-303
ProComp upper & lower intakes
Edelbrock intake adapter elbow
stock TB
Cold Air Intake (fenderwell pick up)
BBK Equal-Length shorty headers
BBK X-pipe
40 series Flows w/ turndowns
Steeda Progressive Rate Lowering Springs
All new shocks, struts, bushings, ball joints, etc...
18"x9"/18"x10.5" FR500 wheels (245/45/18 Front & 285/45/18 Rear)
3.73 gears
I rebuilt the motor myself and she runs like a top. I bought Caroline with her stock engine in fine working order; I had built this new engine for my Mark VII LSC. She runs great, but anywhere under 1800rpm, she chugs so badly and starts to buck. I immediately have to downshift to bring the rpm up to what she likes and then she runs great.
I don't understand why with the B cam and the 3.73's she runs like this... Is there too much duration for the gear or too much gear for the lift? Is the engine pulling in too much air with the CAI, larger intakes, and GT40's that the stock 19# injectors aren't supplying enough fuel? IS it a combination of the two?
This engine has always done this in this car. Last week I started running only NON-ethanol fuel and while it seemed to make her run considerably better, she still chugs...
The other problem I am having is when driving, either accelerating or maintaining speed, you hear this bub...bub..bub...........buh-bub...through the exhaust and you can feel it, almost like a miss... I have new '93 cobra spark plugs (to match the GT40 head/plug specs), maybe it's the wires? Or maybe the coil isn't as strong as the engine needs, just like the injectors...?
Help!!! Please let me know what you think. I am trying to narrow down my next move... This feels like a game of chess...