adialup78

iTrader: (1)

Ok so a little back story on the car. I purchased a 88 vert shell and put a 87 motor in the car. I got the car running poorly at first. Now the car will idle (900-1200) but as soon as you give it gas it dies and then takes a few tries to get it started again. If you give it throttle slowly it will rev up and above 3500 it seems to run fine but as soon as I let off it dies out. I have replaced the MAF with 3 different ones all out of running cars. I replaced the fuel filter, I had the injectors flow tested and cleaned, I changed out the ecu for a n327. Now for the tps I had 2 different ones. I adjusted both for 1k ohms at idle with the car warmed up but as I opened the throttle the ohms went up to about 1.9 at half way and began falling all the way to .3 ohms at WOT. The same thing happened with both tps's. I had the multimeter adjusted to measure 2k ohms and I had the negative lead on both bottom posts of the connector and the positive lead on the single top one just clarify. I also checked fuel pressure which was good. This motor was pulled directly from another one of my perfectly running fc's along with all the components so I know it's a good motor. It sat for about a month before I put it in. All I want to do is pull all my hair and turn this thing into a big bon fire so any help would be greatly appreciated. It sounds like I might have 2 bad tps's but would that cause all these symptoms? Beers on me if you guys can help figure this out. Thanks in advance!

misterstyx69

iTrader: (142)

did you pull the harness with the engine,or did you use the cars original harness and hook up all the engine components yourself?

satch

iTrader: (1)

Not sure how you can have a meter lead on both bottom posts? When measuring for ohms it doesn't matter what color meter lead you use. One lead goes to the top wire and the other meter lead to the lower right wire (looking at the plug from the back). And the range should be 1k ohm at idle position and it rises up to 5k ohms or so at wot. Thus the meter needs to read above 2k. Also, you can just measure the G/R wire w/key to on w/the engine as hot as it can possibly get (20 minute drive) and it should measure 1 volt.

And do you know if the car has high impedanhce injectors or low impedance injectors? To check measure the secondary injector terminals (2 of them) w/the meter set to ohms and it should read close to 12 ohms for high impedance. If it reads close to 2 ohms then you have the wrong injectors.

adialup78

iTrader: (1)

That would make since then. So I should measure at the back of the plug instead of the front post? All the injectors are high impedance. And the harness came with the shell, not the running motor. Could a TPS all by itself cause all these issues?

satch

iTrader: (1)

By measuring from the rear, the meter leads will stick into the back, thus you don't have to worry about holding each lead against the prong. This makes measuring much easier. If the motor is from an 87 then that is the year they switched which type of injectors used (early in the year they were low impedance while later in the year they were not). Did you measure the injectors? If the injectors are correct then whether the TPS is the cause entirely for your problem is an unknown at this point.

adialup78

iTrader: (1)

Yes I measured the injectors last week before they went out for cleaning. 12ohms across the board