Before i finally tear my motor apart to start building her up, id like to ask a few questions concerning the actual problem thats occuring.

Situation: Start car and it idles and rev's fine, no problems, no smoke, nothing is wrong. Drive the car five minutes down the road until fully warmed and a hesitation starts, it starts small as the car warms up and finally reaches a point where acceleration is difficult in all gears except for 1st. The car does not overheat, does not smoke, a/f gauge reads perfectly. Sensors replaced to date include: IAC, intake air temp sensor, map, cam angle, and the egr valve. Parts replaced to date: Battery, intake, filter, throttle body, valve cover gasket, spark plugs, spark plug wires, coil(rewired), head, head gasket, numerous seals, timing belt, water pump, cam gears(timing issue), cat was gutted, fuel pump, fuel filter, gas tank, fuel line, exhaust.

Now, parts that havent been replaced that could cause problems like this: Relays(dont know which), pistons(have new), rings(have new), crank position sensor, knock sensor, oil sending unit, tps, clutch(getting one) and the final thing is my wiring harness which im going to check over FULLY tomorrow. Does any of this ring a bell for you? What in the hell is going on with my car? I havent driven the car for over a month and im running into some problems and i wont be able to rebuild for a while. Any help you can give is apprecaited more than you think. Please help if you can give it, ive tried many simple solutions to no avail, technical help is needed this time. Thanks for your time!

Edit: The front o2 has also been replaced!

Aem Cold Air AFX 55mm TB
Fidanza Cam Gears NGK Wires
AFX UDP Greddy Header
Gutted Cat Greddy Evo Catback
Energy Suspension MMI Eibach Sportlines
Tokico Blues...always more to come

ya bro.....def. check out the harness really good..... i had almost the same prob.. and found out i had a rub tear in my ref. for the map sensor.....cut soliderd and taped... now runs fine...also....b4 u build buy a tps...... u should prolly replace it anyway the map and tps work together... if one fails it looks for the other to compensate..... so your tps could be bad... and the car isnt showing the typical symptomes of a bad tps.... so replace that....... try everything you came b4 the rebuild...cuzz you'll be pissed doing a rebuild and still haveing the same prob.. (been there done that)

jake

M50 I6 DOHC,dinan CAI , Remus Cat back , Volt. regulator, AA stg II software, Centerforce stg 2 clutch w/ alum dual mass flywheel,Stang 27lb inj.,Rouge chasis kit, Mayle balljoints, M3 X brace, 3.35 diff.Bavauto springs w/ tokito struts/shocks.

1997 GS- RIP
engine: AEM cai , pp head / TB / intake runners, Chikira 4-2-1 header , custom 2.5" exhast / pacesetter high flow cat/flowmaster2 muff,1mm over sized SS valves,PT valvetrain, AEM cam gears/pully set, prothane motormounts,440 injectors , ground kit.
Trans: Custom ATX (1 of a kind) poly-graphite steels , kevlar clutches , final drive , shift kit,3500 stall TC, Tourqe Wonder trans chip ($120.00 2gnt price only!!email for order info)

thats exactly why im posting this again, i dont want to go through the trouble of a rebuild and have to blow the fucker up when it doesnt run right in the end.

Aem Cold Air AFX 55mm TB
Fidanza Cam Gears NGK Wires
AFX UDP Greddy Header
Gutted Cat Greddy Evo Catback
Energy Suspension MMI Eibach Sportlines
Tokico Blues...always more to come

well check out the wiring.. and change the tps..... let me know how it goes...also pick up some liquid wrench for the tps bolts....they stick easy and are very easily striped..

jake

AEM cam Gears,MSD ignition,Chikira 4-2-1 header,Custom 2.5" exhast,Pacsetter hiflo cat ,head p/p , intake p/p 2mm oversize tit valves , t/b p/p , shiftkit , TQ lockup mod , and much mor

Replace your coolant temp sensor. Its the topmost one on the thermostat housing. It may not be working properly, and you may be dumping in too much fuel when the motor is hot.Just a thought

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)

ha, ive already replaced that, i just couldnt remember.

Aem Cold Air AFX 55mm TB
Fidanza Cam Gears NGK Wires
AFX UDP Greddy Header
Gutted Cat Greddy Evo Catback
Energy Suspension MMI Eibach Sportlines
Tokico Blues...always more to come

bump, anyone else?

Aem Cold Air AFX 55mm TB
Fidanza Cam Gears NGK Wires
AFX UDP Greddy Header
Gutted Cat Greddy Evo Catback
Energy Suspension MMI Eibach Sportlines
Tokico Blues...always more to come

Well i pulled the entire wiring harness today, unwrapped everything and looked at all the wires. The only problem i saw was with the two wires that run into the coolant temp sensor plug, they were cracked and there were wires exposed. I taped everything up nice and tight then installed everything back. I lost a bolt to my battery connection, so once i get that i'll be able to crank it back up to find out if that did anything at all. Other than a bad sensor i cant seem to fathom what else could be causing my problem.

Aem Cold Air AFX 55mm TB
Fidanza Cam Gears NGK Wires
AFX UDP Greddy Header
Gutted Cat Greddy Evo Catback
Energy Suspension MMI Eibach Sportlines
Tokico Blues...always more to come

well i drove the car today, it ran ok for a while but i could still feel the hesitation once it was fully warmed. I did notice some smoke from the motor though, ever since i installed the new head ive had smoke coming from the rear of the motor near the firewall. I guess i could have a warped head, i didnt take it to a machine shop before i installed it. What do you think?

Aem Cold Air AFX 55mm TB
Fidanza Cam Gears NGK Wires
AFX UDP Greddy Header
Gutted Cat Greddy Evo Catback
Energy Suspension MMI Eibach Sportlines
Tokico Blues...always more to come