randall L

Hey guys.....just joined today. Great site.

89 cher. base 4.0 replaced inj. o rings today cause had leaking & got her all back together cranked right up but choked real quick (2 mins) with some smoke from tailpipe. that 2 min. run was pretty ruff too.
Checked all hoses & fuel in/return & EVERYTHING I had disc. to replace inj. o rings & everything is in order.
Was running fine up until I replaced o rings just leaking around a couple of em so I replaced all 6.
I switched key to "on" about 5 or 6 times (to prime) & she tried to start ONCE........to no avail.
I'm NO mechanic........but any thoughts?
thanks

cruiser54

I'm betting the hose/pipe from the throttle body to the MAP sensor on the firewall got messed up.

randall L

Ok thanks c54........ I'll check it out tomorrow after the market closes.

I'm workin on her following Haynes manual........tryin to learn something as I go.

CCKen

Did you mark each injector connector with its number before disconnecting them, then get them back on in order?

randall L

Yes I marked em & they were replaced in the correct position.

I since found # 5 to be leaking quite a bit. I found a site that sells a set of 6 rebuilt (bosch) injectors with lifetime warrt. for $129 with no core replacement so I think I'm gonna put them in.
I'm also gonna go ahead & replace the fuel regulator while I'm there.
I checked the hose/pipe to the MAP sensor as C54 suggested & it's ok.
Hope this does it.

randall L

Or is there a better route to take? I now understand there may be some here on the forum where I can get a set of 6 injectors? 89 cherokee 4.0

Thankful for all help

cruiser54

I think you're taking the correct route. The stock injectors were prone to leaking externally and causing engine bay fires.

randall L

Ok c54. Thanks for your reply. I have heard about yer knowledge around here so I value your input.

cruiser54

We don't need any Jeep-B-Cues!!!

Expect better idle quality and smoother acceleration/throttle respnse, but the same mileage.
Be sure to liberally oil the new o-rings upon installation.