only accels with light throttle

[oldyak]

my 89 is now only accelerating under very light throttle pressure.any more and it looses power.and even if I can get it to pull,the secondary doesnt kick in.
forum members help would be greatly appreciated!

 

[NotSoSlowSHO]

I would suspect the tps

Try unplugging it for starters

If there is little change, then you need a tps.

 

[mrecoolgar]

That's my first guess as well.
Just replaced the one in my 89 XR7 SC.

 

[rubydist]

in my experience, the only cause for that symptom is a bad tps or wiring to the tps.

 

[bigblock]

i would clean your maf then go to tps

 

[AREA 91]

Run codes
Check TPS voltage
check fuel pressure

 

[oldyak]

Just cleaned the MAF a couple weekends ago.....Ordered a new TPS from Autozone.I will let You know if it works out.Thanks to all who tried to help!!!This forum is SOO much better than the Bimmerfest forum I use for my BMW

 

[Warren]

Oil in the plug wells would cause this also. It would limit your spark if the plugs are covered in oil.

 

[SHO_18]

check valve cover gaskets and spark plug gaskets
i had the same problem and thats what mine was but
i gotta 93
im not guaranteeing you that this is the problem but id
look into it

 

[SHOspazz92]

in my experience, the only cause for that symptom is a bad tps or wiring to the tps.

Plug wells filled with water will also cause this. I had a ton of water get in to my rear plug wells after sitting in a VERY heavy rain (The car has a cowl hood). I tried everything only to feel like a total ******** when I found out the plug wells were full of water. I got a turkey baster, Got the water out, Test drove the car and had all my power and driveability back...then 5 minutes later the clutch went out.

I replaced the plugs and clutch not long after.



-Sam

 

[whiteman_01]

You could also unplug the maf to see if it gets any better.

 

[xxxtommyxxx16]

Where is the TPS located?

 

[trainguy1989]

Where is the TPS located?

On the throttle body. Little black sensor. Right across from where the big spring is that the accelerator cable connects to.

 

[rubydist]

the tps is the throttle position sensor, so as you might expect, it is on the throttle plate shaft, on the throttle body.

 

[xxxtommyxxx16]

On the throttle body. Little black sensor. Right across from where the big spring is that the accelerator cable connects to.

[sigh] only if i could think sometimes.

has any one encountered a problem with these cars, where it will run really rich. i dont have a tach, [currently not working]. is there anyone who fixed this by replacing things or just cleaning parts and checking grounds.

 

[oldyak]

just installed new tps....no change!
Whats next? plugs and wires???
HELP!
Thanks

 

[Vnuk1]

You could also unplug the maf to see if it gets any better.

THIS! Do it...

 

[91PDXmocha]

new plugs, wires and fuel filter
clean or swap the maf
make sure coilpack/wires are plugged in completly
check fuel pressure at the valve with a fuel injection tester

-what sam said I had the exact same thing happen, but should prob do plugs and wires anyways if you dont know when they are been replaced last.

 

[rubydist]

I did work on one car that had no power and didn't want to run right, and it turned out that the timing belt had jumped and the cam timing was off a few teeth. at this point, I would pull off the top timing cover and verify cam timing.

 

[xxxtommyxxx16]

in my experience, the only cause for that symptom is a bad tps or wiring to the tps.

whateles might cause your sho to not excel? i have done TPS and CPS and i clean my MAF.