simonsxj
NAXJA Forum User
- Location
- Daytona Beach, Florida
I have a 1989 XJ with a 2.5 and an auto. What PSI is the fuel pump? I remember GM TBI's being around the same as Carb's. Just want to find out.
Thanks.
Simon
Thanks.
Simon
-
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What PSI is a TBI 2.5?
- Thread starter simonsxj
- Start date
old_man
NAXJA Forum User
- Location
- Loveland, Colorado
I believe it is supposed to be 39lbs.
simonsxj
NAXJA Forum User
- Location
- Daytona Beach, Florida
Thankyou.
Ron Hyslop
NAXJA Forum User
- Location
- Madison, WI
I have a Renix fuel injection manual for my 86(which I think is the same as yours) and it details how to adjust fuel pressure(the fuel pressure regulator is part of the throttle body). It calls for 14.5psi at 2000rpm.
Matthew Currie
NAXJA Member #760
- Location
- Vermont, land of big clay
Ron Hyslop said:
On this one, at least, Chilton FI manual is in agreement.
old_man
NAXJA Forum User
- Location
- Loveland, Colorado
OK, I thought the pressure on the tbi model was the lower number and the mpi which came along in 88 if I'm correct was 39lbs just like the 4.0L. Anybody got a definitive on this?
I have the factory manual on the 85 tbi fuel injection manual if anybody is interested.
I have the factory manual on the 85 tbi fuel injection manual if anybody is interested.
Last edited:
- Location
- Terra Firma
The 4-banger didn't get MPI in 1988 -- MPI arrived in 1991, same year as the 4.0L. '88s were TBIold_man said:
old_man
NAXJA Forum User
- Location
- Loveland, Colorado
Your right. I went back and checked my specs and it showed up in 91. I must be loosing it. I could have sworn it happened earlier. I took an 85XJ with the Carter YFA carb setup and converted it to the tbi setup from an 87. It really made a big difference, but apparently not enough. I swapped that out for a 4.7L stroker a year or so later.
