View Full Version : 89 bronco II 2.9

02-24-2004, 09:11 AM
rebuilt 2.9 with 60,000 k, will not run only has 70psi
in ever hole. pull front cover and timing marks are fine.
wet test doesn't change psi. any ideas would be greatly

02-24-2004, 09:44 AM
Try a different gauge,if the copresion is all the same you could have a bad gauge.

02-24-2004, 03:36 PM
that sounds weurd and wrong..


02-24-2004, 03:49 PM
Yeh it is weird, I thought maybe the valve timing was off causeing
low compression but the marks line up. I guess I will pull the heads
and go from there???[2]

02-24-2004, 04:05 PM
A possible cause could be plugged exhaust.You can check it by drilling a small hole in the exhaust ahead of the converter and mufflers.hook up a psi gauge 0-10 psi.The rule of thumb wiht a runnig engine is anything over 1.5 psi and the exhaust is plugged.In your case wiht a no start and low compression I would guess that you would see over 5 psi just cranking the engine over.

In The Zone
02-24-2004, 06:03 PM
I had the same problem with my last bronco II one of the baffels in the muff let go plugged her up like a stuffed pig .... got more gutless by the minute until
doned on me there was little to nothing coming out the tail pipe.
Bored some big a$$ holes in the muff front wall and she worked till i could service it.

It' a FORD need I say More.....It drinks lots of Gas,Chews Tire's and eat's BUSH

02-24-2004, 07:44 PM
Thanks guys I will put the front back together and try this out!