drift2genrx7

All right the car ia an 88 conv. I did the wiring trick to hopefully help the hestation after 3800. But i took it fir a spin and all i got, with half throttle was like taking the throttle off then pushing it back on and it does this 5 or 6 times up to about 6k rpms. Then i got home and unplugged the wiring and it drove better but it still feels like i am missing power in the higher rpms. Im gonna play with the 5&6th ports and maybe try some diff injectors but any insight would really help out. Thank you.

SureShot

A worn out TPS will give those symptoms.
Using test lights or voltage at idle readings will get your idle setting perfect, but you could still have a worn out TPS resistor.
-The golden test:
Unplug the TPS connector.
Clip a cheap analog (needle type) VOM on the green & orange pins.
Set it to the 1K scale.
Hold off the throttle & work the short range TPS plunger in & out.
You should see a smooth sweep from ~0 to ~5K ohms.
Any bad spots or drop outs in the stroke - it's bad & will give fuel cuts at part throttle.
(Before you toss it, try spray contact cleaner between the sleeve & plunger.)
Find the fast idle (warm-up) cam & back it off so the throttle sits on the hard idle stop.
Adjust the setting to 1K ohms.
While holding off the fast idle cam, open & close the throttle a few time to see that the 1K setting repeats.

drift2genrx7

I was kinda thinking that, and was trying to avoid it but il give it a shot today thank you.

WAYNE88N/A

If your TPS checks out good, gain access to the ground terminal on top of the rear rotor housing, and give it a good cleaning & retorque...

Molotovman

iTrader: (49)

also, do not ground the pressure sensor.

drift2genrx7

I have checked a few more things, tps good, regrounded the top of the engine, etc... But i wanted to try something diff, so i swaped my secondaries and the primaries around and know the car runs like crap. Checked the injectors and the old primaries were low imp injectors and the old secondaries were high imp inj. I know the 86-88 cars are supposed to run on low inp. inj but could this cause this kinda problems, or could i just have the injectors cleaned and put them back in?

HAILERS

86-87 1/2 are low impedence. See the fsm for the location of the solenoid resistor that would be under the afm/filet and see if it is there. It's mounted on the fender down there.

drift2genrx7

well the car is an 88 but the ecu and engine is out of a 86. i have 4 injectors that are high and 2 that are low. If i try to put the high ones in what should i do about the resistor rewire or just unplug. I have read something about about this a while ago but i could not find it or maybe im just dumb, hell it could be both. Thanks hailers

drift2genrx7

All right I went and got some injectors from a known running car that were low low ohm. I put them in as my secondaries and the car seem to have run better, but when i get to 3800 rpm its like i hit a wall. The 5/6th ports are smooth to open by hand, could that still be a prob. I can get above 3800 by slowly bringing up the rpms but once i open the throttle up more it wants to stay at 3800 or less. by the wy this does this either on the road or stopped, just revving the engine. Im at a lost here guys any help would be very greatful.

WAYNE88N/A

You don't "hit a wall" when the ports don't open, so I wouldn't worry about them just yet...

What is the build date for your car? Anything after 7/87 should be a "high impedance" setup. If it's 6/87 you're going to have to look at your VIN#, anything after #7601 is high impedance.

This all holds true, unless somebody's installed their own "version" of the harness & injector setups in your car...

The sure fire way to troubleshoot your secondaries is to read out the injector "inputs" at the two secondary pins (3F & 3H) to ground, at the ECU. Look in section 4 of the FSM, available online at TEAMFC3S.ORG for a "pictorial" of the ECU pins. Take the car for a "spirited" drive, and watch the meter at the 3800 rpm mark, the 12 volts should start to fall when the secondaries kick in...

drift2genrx7

well here is the scoop, the car is a an 88 convertable. the engine is not the same as well as the ecu. Its like the car was stolen and evrything was gutted and i mean GUTTED. Well the wiring seems diff, but there are additional wiring to go to certain relays are the top. Either way the car idles perfect with the low imp inj. put the high ones in and the acr doesnt run all to well but it does run. Ill try the drive and see what comes of it and let you know in lets say 20 mins time right now on the forum 2:24

drift2genrx7

well they do fall from 14 to 11v. they do exactly the same as the primaries. Hmmm, some more trouble shooting.

drift2genrx7

well decided to try something, thinking the injectors were gummed up so i took a positive wire and a negative wire hooked them up to the injector and at first the injector did nothing. Well after taking the pos wire off then in again it started to click-YAY!. Did that to both of them and took the car for a drive and i got no hesitation at 3800 it still seems a little low on power but it only has 300 miles on the rebuild, but it idles perfect, starts everytime, doesn't smoke, and no vibration. I think I deserve a pat on the back, thanks for everyones help.