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Old 11-02-2006, 11:15 PM
re_fill re_fill is offline
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EFI - Vacuum Lines - 1990 302

New post, same problem. I posted this some weeks ago where I changed my plugs, wires, and filters, then miserably failed an air-care test. Well as I reposted, I had been a little careless when installing the plugs and cracked the porcelain insulator on 1 (or more) plugs. I since replaced ALL the NGK's with Bosch plugs (I blamed it on the NGK's, but that was wrong). So now it runs well, but won't idle. It "hunts" if you know what I mean. If I come to a stop, it will stall unless I put it in neutral. In neutral it will stall if I turn the steering wheel. If I put ANY load on the engine in neutral, it will stall. So I figure that when I changed the plugs I have knocked or broken or undone a vacuum hose or some other EFI mechanism. If I hold the pedal at 800-900 RPM, no problems, but that is wrong. I can't find or see any problems.

Anybody have or know of a schematic of the EFI system and vacuum hose routing to troubleshoot this goof-up?

As always, thanks in advance.

phil
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Last edited by re_fill; 11-02-2006 at 11:25 PM. Reason: my Pinto de-Tomaso got rear-ended and DIDN'T blow up, the Firenza did
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Old 11-03-2006, 05:47 PM
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dwoodler dwoodler is offline
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It should be on a sticker under the hood. Either on the air intake box or the along the front somewhere.
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Old 11-12-2006, 09:35 PM
carriljc carriljc is offline
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I replaced all the hard plastic vacuum lines...

with rubber tubing a couple of years ago. It eliminated a bunch of problems, and it's run a lot better ever since.
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Old 11-13-2006, 05:46 AM
b4hntn b4hntn is offline
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My hose diagram is hard to read where they put it. A digital camera helps a lot. If you do not have one a MityVac vacuum tester is about $30 then you will know all the vacuum systems are correct. Then you did not mention pulling codes?
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Old 11-13-2006, 05:59 AM
buggzz buggzz is offline
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Check and then re-check your spark plug wires. From what you have said (changing spark plugs twice and all) I'd bet you connected the spark plug wires wrong and messed up your firing order.

What was the results of the emissions check? High hydrocarbons, high NOX, etc?

It could be a vacuum line, check them as well.

Ask your tranny shop if they removed the upper intake in order to lift the motor to change the rear main seal. If so, they probably created an intake leak.

Above all, Stop just replacing parts in the hopes of fixing it. diagnose the problem, test the suspect part, and then replace it if necessary.
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Old 12-27-2006, 07:14 AM
phildntn phildntn is offline
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vac lines

Try looking at the red vac lines on top of the motor they are made out of a hard composite material and can crack with out it being visable my truck would stall at every light once I changed mine on my 93 bronco no problem it has run fine since.
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Old 12-28-2006, 03:46 PM
re_fill re_fill is offline
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It wasn't the vacuum line(s) afterall

Thanks for the insight, but as it turns out, my fuel pressure regulator AND Oxygen senser weren't working. The engine was constantly flooding. All is well now.
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Old 12-28-2006, 03:46 PM
 
 
 
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1990, 302, 460, efi, f150, high, hose, hydrocarbons, idle, lines, plug, routing, routing302ford, schematic, vacuum, wire

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