Not too sure what else to do, any ideas?

10

Asked by Jul 02, 2016 at 04:53 PM about the 1988 Ford Bronco II

Question type: Maintenance & Repair

It won't start we've adjusted the timing and think
we have it timed. There is no compression is one
cylinder, and barely any in another. Finally got it to
start last night but only for a few seconds, seems
like it was getting flooded with fuel.

7 Answers

104,275

Pull the vacuum line off of the fuel pressure regulator and then just turn the key on, if fuel sprays out of the regulator where the vacuum fitting is then the regulator is shot, of course you must have compressin to run, so you could be just chasing your tail until the compression is back up to par.

10

We've done that as well, no fuel sprays out from there but that vacuum line sits on the intake very loose, it's worn out. I would think that the motor could still start with bad compression, its only on 2 cylinders, wouldn't it just run like crap?

104,275

Frankly I'm surprised it even started with just two cylinders, your going to have to,at least pull the head to find out how much damage is in there, could be a cracked cylinder head.

10

Sorry I mistyped so cylinders 4 and 6 are the ones with very low compression #4-15 #6-30 but I had thought that the main things needed for a motor to run was fuel/vacuum and timing?

104,275

You need compression, without it wheres the bang, all you get it is poof, and theres no power in a poof.

10

Oh well that does make sense. Poof isn't really enough to start a motor.

71,685

If cylinders 4 & 6 are next to each other, you have a head gasket that's blown between the two cylinders. That's why you have no compression on only those two cylinders. Is the compression good on all the other cylinders? If so, it should still run. It'll run poorly though. HTH. -Jim

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