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Old 10-04-2016, 04:43 PM   #1
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1985 Allegro with 454- starting problems

Hello, I have a 1985 Allegro with a 454 engine, parked in Baja. It developed an intermittent starting problem that has now become permanent. When I turn the ignition key, the brake indicator light on the dash comes on, but there is no click or noise from the starter or solenoid. The battery is fine. Battery cables are clean. And I can jump the solenoid, and the engine cranks. I replaced the ignition switch and cleaned whatever connections seemed important.

I'm a hobby type mechanic and this is beyond me. My guess is that there is some kind of switch or solenoid between the ignition switch and and solenoid that has gone bad, but I can't find it, and I'm not sure where to look.

Any ideas?
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Old 10-04-2016, 05:02 PM   #2
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There may be a fuse link in the wire that has blown or the solenoid no good. check the wires going to the solenoid you can locate the fuse links. they look like the size of a cigarette filter over the wire it s about 1" long.
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Old 10-05-2016, 12:12 AM   #3
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Neutral switch OK?
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Old 10-05-2016, 12:49 PM   #4
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These are both good suggestions. I've done a little research on the neutral safety switch and there is conflicting information on where it is located. On a P30, is it on the steering column? Or on the automatic transmission?

Regarding fuse links, can you buy replacement fuse links and just swap them out with the blown ones?

And finally, is the whole starting system something that Chevy included in the P30 chassis? And therefore I should be able to find a P30 wiring diagram? Or is the starting system something installed by Tiffin Allegro, so that I need that model's particular wiring system?

Thank you again for your suggestions.
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Old 10-05-2016, 01:05 PM   #5
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Sounds like neutral safety switch is a good place to start. Should be per the GM wiring diagram, it might be built onto the steering column. Try wiggling your shifter (I assume shifter on the column) and see if it cranks. That would be easy test for NS switch. If my memory is right, based on hot rod activity with GM columns, the starter wire is purple.

If your NS switch is bad, you can just connect the two wires going to the switch together, making the electrical connection. The NS switch is normally open and is closed in Park or Neutral position. So you can just bypass it for temporary to get going. Should replace it though as it is there for safety to prevent starting in gear.
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Old 10-05-2016, 01:05 PM   #6
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Have you jumped the starter with the key on ?

The neutral safety switch stops cranking, usually not ignition.

See if there is a secondary relay ( solenoid ) that supplies the starter solenoid.
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Old 10-06-2016, 07:00 AM   #7
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If you find a wire that has a fuse link it looks like a filter pull on the wire from both sides of the filter. if it feels loose like the wire is broken then the fuse burnt out . You can purchase a water proof fuse from an auto parts store and just attach it to the wire . Also like stated it might be the neutral safety switch burnt out or just out of alignment try wiggling the gear shift when trying to start.
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Old 10-06-2016, 07:03 AM   #8
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Quote:
Originally Posted by steppinstone View Post
If you find a wire that has a fuse link it looks like a filter pull on the wire from both sides of the filter. if it feels loose like the wire is broken then the fuse burnt out . You can purchase a water proof fuse from an auto parts store and just attach it to the wire . Also like stated it might be the neutral safety switch burnt out or just out of alignment try wiggling the gear shift when trying to start.
https://www.delcity.net/images/photo...mary_225px.jpg
here is the fuse holder you can replace the link with
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Old 10-08-2016, 07:11 AM   #9
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is this engine carb or throttle body injected?? It could be either one on that year I also think it is obd 1 system.
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Old 10-09-2016, 01:14 PM   #10
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It has a Rochester Quadrajet carburetor that I just had rebuilt. Not sure about the OBD1 system- is that related to the air pollution control equipment?

VIN is: 1GBJP37W8F3303289

The sticker on the air cleaner is: XFZ 7.4 liters EGMO7.4ABB8
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Old 10-10-2016, 08:07 AM   #11
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Ok very simple engine to work on. Lets start with the basics. Suck squeeze bang blow. Suck = intake lets assume that is ok. Squeeze = compression we will get back to that later. Bang = spark land blow = exhaust. lets start with the easy stuff Take some gas about a few bottle caps full and pour it into the carb. now crank the engine and see what happens. Does it try to run or just cranks over but does not run?
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Old 10-10-2016, 08:26 AM   #12
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Originally Posted by badturks5 View Post
Ok very simple engine to work on. Lets start with the basics. Suck squeeze bang blow. Suck = intake lets assume that is ok. Squeeze = compression we will get back to that later. Bang = spark land blow = exhaust. lets start with the easy stuff Take some gas about a few bottle caps full and pour it into the carb. now crank the engine and see what happens. Does it try to run or just cranks over but does not run?
Why would he pour gas in an engine that doesn't crank ?

There is no Intake, Compression, Power, Exhaust going on.

The OP stated that he can only get it to crank by jumping the starter.
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Old 10-10-2016, 08:52 AM   #13
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yep wrong thread sorry my bad
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Old 10-10-2016, 08:54 AM   #14
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was helping some else with a no run problem got my threads mixed up old age what can I say
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