finished engine swap, elec/ gauge issue

shmoken875 · Jan 11, 2009

Buddy's 97 xj blew up the 4.0. Found a 96 4.0 at the junkyard; when pulled it had good oil pressure. After 16hrs we got everything swapped over, and it fired right up and ran smooth around the neighborhood. BUT about 1 second after start up the voltage, and oil pressure gauges read 0, Gas/Tach/Speed/Temp all work fine. Voltage initially reads correct, then goes to 0, and oil pressure gauge never has a chance to read. Any ideas?

Rodrigo_XJ · Jan 12, 2009

Are you using the same old oil presure sensor of your 97????

Regards

shmoken875 · Jan 12, 2009

Rodrigo_XJ said:
Are you using the same old oil presure sensor of your 97????

Regards

no, the unit came on the 96 engine.

old_man · Jan 12, 2009

Make sure the ground strap from the head to the firewall is intact.

shmoken875 · Jan 12, 2009

old_man said:
Make sure the ground strap from the head to the firewall is intact.

yep it is, we've gone over the engine several times to make sure nothing was left disconnected.

bcmaxx · Jan 12, 2009

look close! I went through hell with a high idle problem after an engine swap, ended up being one of the wires going from the harness to the dipstick was damaged. Its as easy as that! Make sure the engine to firewall ground is goos ,as well as the main ground, I even addeda couple for the hell of it.

Rodrigo_XJ · Jan 12, 2009

shmoken875 said:
no, the unit came on the 96 engine.

I woud fit the same sensor you had in the old engine and check.

shmoken875 · Jan 12, 2009

Rodrigo_XJ said:
I woud fit the same sensor you had in the old engine and check.

may try that, still don't understand the voltage though

Rodrigo_XJ · Jan 12, 2009

Have you a battery charging problem or is only a gauge issue?

shmoken875 · Jan 12, 2009

Rodrigo_XJ said:
Have you a battery charging problem or is only a gauge issue?

No it was charging, was just the gauge. He just called me though and said the voltage gauge is working fine now. Had him go back to the yard and pull the oil pressure sending unit off the crap 97 motor this evening, and we'll see if that works, maybe the 96 unit got damaged on the ride from the yard.

shmoken875 · Jan 12, 2009

EVERYTHING FIXED! THANKS! Voltage gauge worked itself out, and somehow the oil pressure sending unit died between the junkyard and his house. The yard let him have the one back off his 97. Sure feels good to get everything working right.

Rodrigo_XJ · Jan 12, 2009

Great! party1:

finished engine swap, elec/ gauge issue

shmoken875

NAXJA Forum User

Rodrigo_XJ

NAXJA Forum User

shmoken875

NAXJA Forum User

old_man

NAXJA Forum User

shmoken875

NAXJA Forum User

bcmaxx

NAXJA Forum User

Rodrigo_XJ

NAXJA Forum User

shmoken875

NAXJA Forum User

Rodrigo_XJ

NAXJA Forum User

shmoken875

NAXJA Forum User

shmoken875

NAXJA Forum User

Rodrigo_XJ

NAXJA Forum User

Similar threads