1995 Jimmy Hard to Start

[79MKII]

Hello Everyone,

I ran across this forum while looking for a solution to a problem I'm having with my '95 Jimmy 2-door 4x4. Seems like a nice forum so I thought I'd join. I first bought this Jimmy in 1997. It has gone through several family members and now I have it back. It needs alot of work so I've been working on it slowly over the last year or so. The starting issue appeared after the first freeze plug leaked...don't see how it could be related.

Here's the story on the Jimmy: It's very difficult to start but runs perfectly after it's started. I have to try starting it in short bursts for it to work...takes several tries but it eventually fires and stays running. If I just let it crank it won't start.

Here's everything I've done so far...all AFTER the starting issue began:
-replaced air intake boot (torn)
-replaced several brake lines (rusted,leaky)
-replaced transmission cooler line (rusted, leaky)
-replaced 2 freeze plugs (rusted,leaking)
-replaced EGR valve (including new gasket with screen)would act up once in a while and needed removed and cleaned
-replaced fuel pressure regulator
-replaced distributor cap and rotor
-replaced spark plugs
-installed all new exhaust including cat converter and O2 sensor
-installed new fuel filter

I'm getting 52-54 psi fuel pressure at schrader valve with key on, engine not running. Pressure drops pretty quickly after key is shut off (2-3 minutes)

I'll attach a picture of my intake plenum...this is why I thought the regulator was shot...looks like that side is "washed"??

Any help would be greatly appreciated. Thanks!

 

[ferretx9]

For what its worth Haynes manual reads -
Multiport FI system 41 - 47 key on not running , drops 3 -10 at idle
Central multiport FI system 58 - 64 '' '' '' ''
Central Sequestial Electronic FI 55 - 61 " " "

 

[79MKII]

For what its worth Haynes manual reads -
Multiport FI system 41 - 47 key on not running , drops 3 -10 at idle
Central multiport FI system 58 - 64 '' '' '' ''
Central Sequestial Electronic FI 55 - 61 " " "

Thanks...I've been looking for the correct fuel pressure spec. I think mine is the Central Multiport??....seems like an oxymoron...is it central or multiport? There is a central injector but it's routed to each port....I guess that's what they mean? I don't believe it's the first one but could be the third one?

 

[79MKII]

Anybody know the proper fuel pressure spec for 1995 Jimmy 4x4 2-door?

Any good posts of fuel pump replacement? Can't believe I can't find one....