Well i just picked up another fc. i have a 91 S5 and the one i bought is a 1990 convertible. well the reason i bought the car was to take the motor out of it and drop it into the 91. Well right now the convertible runs, but has some problems. i push the gas pedal to the floor and it is not getting any acceleration. ive read that it can be due to dirty injectors or other things. Can anyone give me some suggestions on what could be causeing this?

 

That could be a number of things. Clogged or stuck open injectors, clogged exhaust or intake, non working AFM, low compression, throttle cable isn't set right, TPS isn't set, timing could be off and needed to be set, low fuel pressure, could be the ECU. Honestly the list goes on. You kind of have to be more specific on how the car acts under load. It could something as simple as the OMP connecter not plugged in. I do know this because Im having a problem with my car idling. On the s5 cars there is a narrow range and wide range TPS, if the narrow range is out of adjustment or not working at all then the car will run in limp mode because it controls the electronic OMP and it sends the position of the throttle plates to the ECU to tell it how much air and fuel to send. Obviously if thats off it wont be sending the right amount so set your TPS to 1 thousand volts via multimeter or look at the fast idle cam on the throttle body on the side where your throttle cable is. Set the fast idle cam if it needs adjusting.

 

That's one hell of a multimeter you've got.

 

Well that is what I have been reading on the TPS faq. Everyone is saying 1 thousand volts but it will read it like 1.00 on the multimeter. Not really sure on that one but I know it has to be set between .75 and 1.25 right? Narrow range Im talking. From what I know the wide range usually doesnt need to be adjusted but should be between .25 and 1.25 when the narrow range is set.

This is a quote from Aaroncake from the TPS setting faq and is where I got the 1 thousand volts from so maybe I got confused with the constant references between volts and ohms.

Adjusting the TPS is a simple maintenance item that should be preformed at any oil change. The benefits include better gas mileage, better performance and a smoother idle. Adjustment only takes a few minutes if you follow the directions below.

What You Need
· Ohmmeter
· Flathead Screwdriver
· Half an hour

How To Adjust
· Warm the car completely by driving for 20 minutes
· If your car is a turbo, remove the intercooler. Loosen the hose clamps on the inlet and outlet, remove the vacuum line, and then remove the four bolts (I believe 11 or 12MM). Lift off the cooler. Do this quickly so the car does not cool.
· Unplug the TPS. On 89+ cars, you want to unplug the connector leading from the lower TPS.
· Hold the TPS connector so the hump points up. Connect your meter between top connection and rightmost connection.
· Adjust the stop screw until the meter reads 1K (1000 Ohms)
· Plug the TPS back in
· If necessary, reinstall the intercooler. Don’t overtighten the hose clamps
· Drive the car for a few minutes, then repeat the procedure

 

Ohms is not the same as volts

 

Well obviously thats where I got confused then huh