Crank no start

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Nov 11, 2015 | 05:39 PM

1973dieselhighboy

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From: elk plain, wa

Crank no start

So the truck is a 89 f-250 auto with a 460.

I picked up this truck for cheap about 2 years ago note running. Guy said it jumped time and had pulled it down to the timing set and stopped had new chain for it. so I put it on a trailer and pulled it home and put it in my garage. Replaced chain, cap, rotor, plugs and water pump. Got it to start and went and drove it. Made it about 1 mile from my house and started running poorly. Limped it home.

When I got home I found the exhaust was orange so hosed off the cat and then pulled it in my garage. Went out the next morning and unbolted the cat.

This is were it gets odd. Cranks and fires on a couple cylinders then flat crank. Fuel rail 45psi cranking. Good spark. Numbed my hand and half my arm. So I checked the tfi module on a buddy's truck, good, check pcm cause the injectors are not firing after the first couple fires, it's also good.

I am stumped I am looking for ideas. My only other thought is the o2 sensor. That's the only thing I can think of that will affect fuel.

Has anyone ever had a crank no start do to a o2 sensor?

Nov 11, 2015 | 11:52 PM

TobaccoBarn460

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From: Ky

Have you considered a distributor with a new PIP sensor?

Nov 12, 2015 | 05:52 AM

bashby

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From: Charles Town, W bygod Va

The o2 sensor has no bearing until it warms up, so it will not cause a no start.

Nov 12, 2015 | 05:54 AM

bashby

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From: Charles Town, W bygod Va

Did you confirm the injectors aren't firing or is that just a theory? It should run on starting fluid if that's the case. I'd check the timing.

Nov 12, 2015 | 07:47 AM

subford

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From: Easton,Ks

You might have a bad fuel pressure regulator and a flooded engine.
45psi is too high for the 460 as the max it should be is 39.2psi as most say around 40psi.
Try holding the the throttle at WOT while cranking and see if she starts then.

Nov 26, 2015 | 01:21 PM

1973dieselhighboy

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From: elk plain, wa

Ok so I finally got some time to go and look at it. When I put the pcm and tfi module back in a couple weeks ago it fired up but I had to keep the throttle pushed between a 1/4 and 1/2 and then after about a min or 2 died and wouldn't fire.

Put a gauge on the fuel rail and I am sitting around 38-40psi cranking. So that is in check.

I have spark I pulled a plug wire off and it is getting spark.

I did notice when I was moving the distributor There is a clicking noise in one spot. Tracked the noise down and it sounds like a injector clicking. I know the tfi module is good been tested a couple times and ran on a buddy's truck. So I know that is good. Looking for any ideas.

Nov 26, 2015 | 07:43 PM

TobaccoBarn460

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From: Ky

There's too much in question here, so if it were me, I would go back to square 1, and go through everything.

For example, you tested the Ignition module on your friends truck.

Great, except that's no guarantee that you have an intact circuit back to the EEC in your truck.

You had spark.

Did you have it while you had 40 psi fuel at the rail?

Was it "hot" spark?

Was it "in time" spark?

You may have an intermittent circuit problem.

Do a compression test on all cylinders.

Line up #1 at what is for SURE TDC.

Get the perfect fuel, spark, and air combination there at the right time.

That's a lot of steps, any shortcuts and your guessing.