need your thoughts please

[TurboTurismo]

Hi all, I have a 90 TBI and need to replace the throttle body. I have a 94 Throttle body for to use..The only difference between the two that I can see is that the 94 tb does not have the throttle body temp sensor anymore..I did some research and found that they didnt use it on the 94 model year... Therefor..can I use the throttlebody...I also would run the 94 comp as it does not have the temp sensor programmed in it from the factory...also the 94 comp does not have the egr funtion programmed into it, so I though of maybe using an egr blockoff... BUT from earlier discussion I heard that the pcm with egr will allow me to set the base timing higher, like to 15 drg without knock or ping.....

any and all comments or tips would be great
Thanks for your time

Robb

[allmotor]

are you sure you really want my opinion?

[TurboTurismo]

LOL AllMotor.... I do not think the first part of the question is a dumb one..... Hey I have always taking your advice, you have been right 99% of the time with my quirky ?s Git er Dun Son

Robb

[moparfwdsleeper]

i wouldnt see any problems in it. your canceling out the temp sensor by using the 94s computer so there isnt any reason for me to see why it would cause a problem

[ZoskalonMPI]

Are you using the same wiring harness? Make sure there aren't any differences between the 94 and the 90 harnesses. Make sure you get those answered.

[DaytonaTurbo87]

Just throw in the newer stuff, if it doesn't run right, bfd, get a slightly older tb from the junkyard. It's a low hp tbi car, I would lose any sleep over it if I was you. Heck, personally I'd just throw in the newer tb with the older computer. Probably throw a code for the intake temp, but I'd just use it if it still ran fine/got good mileage.

[phantomrt]

The 1990 TBI cars run substancially less fuel pressure. The fuel regulator will need to be changed out, possibly the injector, too, but I do not know.

Starting in 1991 the TBI's used the higher fuel pressures like the V-6 and Turbos did.

[TurboTurismo]

Didn't really think it would make a difference as I was told they all changed down to 15 or so lbs at the tbi << from the fp regulator even after 91......... So I understood

Robb http://www.cardomain.com/ride/2291434

[phantomrt]

I'm not POSITIVE what the cut-off year was... I THINK it was 1990 but the early TBIs ran something like 15 PSI of fuel pressure. The later years it was something like 35 PSI fuel pressure. Take a look at the pressure regulator on each throttle body... I think it is stamped in there.

I was told much the same about fuel pumps and clutch sizes TBI vs turbo and I believed it until I took the stuff apart myself to look and compare part numbers, etc. Starting in 1991, they all used the same fuel pump in the TBI, V-6, and turbo. Size of the clutches are also the same for them all.

[TurboTurismo]

ok tried the pcm swap and the car stars and runs really nice BUT the asd code 42 is on and I think it because the comp is trying to add more fuel..I still have the 14.5 lbs pump and matching injector and fp regulator.. Think I need to go to the higher pressure pump and change out the throttle body assembly to the 94 model???

[ZoskalonMPI]

Quote:

Originally Posted by phantomrt The later years it was something like 35 PSI fuel pressure.

I just had my fuel pressure checked friday, its a solid 59psi, I guess the later the better lol

Just out of curiousity, with the MPI system, you can check the pressure from the fuel rail, but how and where do you check the pressure on the TBI injected cars?

[TurboTurismo]

The tbi cars are checked before the tb fuel inlet as far as chilton describes it, by adding a tee and related clamps...... On my post above, damn forget the 94 sbec.. ya it does have a smoother idle but the damn thing has less power thru out the driving range......it almost seems to loose all its power..must be in the software for emmisions stragegy or something..Im back to the 90 sbec now and all is well....