so this is the deal. i bought a 87 TII for 450 not a bad deal. i replace the fuel pump with a TII fuel pump i removed all the emissions and i have a FCD and 3in intake and 2.5 in exhaust. the hesitation is regardless of if im on boost or not. it always happens at 6800. i tried it to day with no boost and it still did it. its not the same feeling as fuel cut but similar. any thoughts on this.

what been done and replaced

new tII fuel pump
exhaust
efan
new plugs
fcd
boost gauge
k&n intake
emissions removal
waterpump

could it just be that the injectors just need to be replace. i know the ohms on the tps are good i tested.

 

Did you replace the fuel sock with a new one? Also, the fuel filter could be clogged as well.

 

I had a big problem w/ my t2, felt like it hit a brick wall at about 5 grand or so in 2nd gear.
Ended up being a dirty air filter, the motor was choked for air.

And I agree w/ replacing both fuel filters (sock on pump, filter in engine bay) if you have not already.
Clean/flow the injectors too, and replace any fuel line that is hardened/cracking. fuel pulsation dampener too, lol

Gotta love that preventative maintenance



Do you still have your pre-cat/main cat? One may be clogged possibly......I'm thinking its some sort of flow block in the intake/exhaust.

 

did you check the timing?

 

hmm i haven't cleaned the intake in a while. ill clean that and see what happens. i replace the fuel pump sock and also the fuel filter. i was thinking maybe new plug wires. the plugs only have about 2000 miles on them. i have no cats just a pipe back to the mufflers. i am going to replace the fuel tank on sunday. the current one has some rust in it from what i could tell. that might be the problem in the end. dunno though.

 

The motor is starved. Flat would be fuel or air. Hesitations would be the spark not strong enough and being snuffed out. Try puting new plugs and wires in "NGK".

Considering it is not an electrical ground issue or TPS.

 

I'm in the same boat right now. Engine just quits like I let off of the throttle at that rpm. I have an rtek, so it's not fuel cut. I was advised that it was fuel related so I pulled my fuel sender today only to discover that it was rusted to hell, but surprisingly, it still worked. The filter sock was so plugged up too. So I cleaned everything and put it back. I am going to take it for a spin tomorrow to see if that fixed the problem for me.

 

Maybe a bad TPS?

 

In my case, no. TPS is set as specified in the FSM and it does not have any dead spots. Car runs great anytime else. Smooth, no burps. As for the original poster, definitely replace your fuel filter if you haven't already. That can slow fuel down in time of need.

 

mine does it too right at 6500, in or out of boost. I have replaced plugs and fuel filter, and the fuel pump is pretty new. I'm going to check my grounds probably tomorrow.

 

My car has an electrical short which causes the car to lose power and stall dropping the rpms more than expected and making them real loophy, thankfully i dont have high rpm hesitations.

Most of my hesitations I'd ever have were the 3500 hesitation and hesitations from having the 5/6 ports removed.

 

What is the max resistance on the TPS?
Or did I already talk to you on this?


-Ted

 

i check the resistance on the tps. cant remember right now. i know that it didn't go past specs. i swaped out the gas tank for one in an N/A. the tII gas tank was rusted to hell so i would assume that was the problem.??? i also changed out the fuel filter. looks like i had a little rust in the fuel filter. i hope that my injectors aren't fucked. i am going to buy new plugs and plug wires. the current plugs only got a little over 2000 on them but theyre not to expensive. i dont know how many miles on the wires though. with all my mods is it bad to run the rest of the 87 octane out or should i have dumped it all??? im not boosting at all. LOL i don't want to blow my motor.

 

Oh ****, rust in the gas tank...that's bad.
I would replace both fuel filters, the fuel pump, and get the injectors cleaned or replaced.
Rust or debris in the gas tank is very bad.


-Ted

 

i did replace both filters. it was so cold out side i couldn't feel my feet lol. my buddy was telling me about this stuff called sea foam or something he said that it worked really good any one heard of this stuff?

 

Oh...

I was scrapping handfuls of rust out of my tank the other day. I have a nice ant hill sized mound of rust on the ground from the tank and that is only from around the pickup area. There was also plenty of rust powder on the roof of the tank. I am just curious how there could be so much crap in the tank. Maybe sitting for 5 years might explain it. :/ Besides the pump, are there any differences between the TII and N/A tanks? I can swap the one from my other car. What would be a good chemical to use to clean the tank? What annoys me the most is that I filled the damn tank to the top the other day and only put 13 miles on it.

 

the tanks from the s4's are the same but not the s5's. you can get them to fit you just need the s5 straps if your going to use one from another series.

 

Back to the 6,800 RPM hesitation... Back in '98 I did a GXL to TII conversion that did the exact same thing. Boost, no boost, full or part throttle. Just feels like a rev limiter kicking in!

It is your TPS not reading WOT, ignore what the Ohm test says. Swap it with a buddies that doesn't have the problem. You'll see.... ALSO ck the TPS wiring esp the plug for corrosion.

Untill you fix it don't drive it reving past 4k. You're leaning the motor out everytime you do. It may feel ok but it's not.

 

well i just got done racing a civic and now with the new gas tank and new filters the car seems to do just fine....no hesitation. although i did get pulled over afterwards a couple of miles down the road. the cop said that my mufflers were illegal???? he didn't even make me sign the ticket. i thought that i did????