iBrent
Veteran CEG'er
So I have the same hesitation/bucking issue that many people have. I've done a lot of thread hijacking but never started my own thread. I figured its about time. It started about a year ago, back then it was very slight and almost unnoticeable. It has since been getting progressively worse. Its so bad now that my whole body moves front to back in third gear while accelerating. Its worse around 1500 RPM. For example, i'll be cruising around ~35mph in 5th gear (1500 RPM) and it will buck with our without throttle. When the throttle is slightly opened, it will get worse. At WOT, it's still there, but not as bad. Another example, I was in 2nd gear and revved it up to about 4500 RPM. Then I let go of the gas and let the engine slow me down. Once the RPM's got to 1500 it started bucking and got progressively worse until idle. It feels like when you're learning to drive a stick and the car bucks back and forth. Its not quite that bad, but you get the idea.
I've done lots of searching and replaced a lot of stuff. Its really bothering me. Help please!
Here's what I've done over the last year (in order).
Had a CEL, replaced fuel filter and pump. Fixed other problems, but the bucking was still there.
Replaced plugs/wires with APP764's and motorcraft wires - NO CHANGE (not better or worse)
Cleaned K&N and re-oiled - NO CHANGE
Tested coil pack, tested out of spec, thought i had something, replaced with autozone brand...- NO CHANGE
Checked spark plugs for carbon tracking and checked gap, all tested fine.
Rebuilt intake and cleaned IAC (yesterday) - NO CHANGE
I thought I had it with the intake rebuild...but 'twas not the case. Also, when the car is warm it seems my IMRC is malfunctioning and the bucking is worse. I bought a replacement transistor and will be replacing it this afternoon. That may fix the IMRC issue, but probably not the bucking.
Any help would be greatly appreciated...and if you successfully diagnose the problem, perhaps rewarded.
I've done lots of searching and replaced a lot of stuff. Its really bothering me. Help please!
Here's what I've done over the last year (in order).
Had a CEL, replaced fuel filter and pump. Fixed other problems, but the bucking was still there.
Replaced plugs/wires with APP764's and motorcraft wires - NO CHANGE (not better or worse)
Cleaned K&N and re-oiled - NO CHANGE
Tested coil pack, tested out of spec, thought i had something, replaced with autozone brand...- NO CHANGE
Checked spark plugs for carbon tracking and checked gap, all tested fine.
Rebuilt intake and cleaned IAC (yesterday) - NO CHANGE
I thought I had it with the intake rebuild...but 'twas not the case. Also, when the car is warm it seems my IMRC is malfunctioning and the bucking is worse. I bought a replacement transistor and will be replacing it this afternoon. That may fix the IMRC issue, but probably not the bucking.
Any help would be greatly appreciated...and if you successfully diagnose the problem, perhaps rewarded.