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#1 |
Registered User
Join Date: Jun 2005
Location: La Honda, CA
Posts: 15
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engine won't stop
hey all,
so my truck suddenly does not want to stop. so today i picked up a new ignition switch and installed it. plugged it all in and the same thing. it starts up fine, just won't stop when i switch to off. it doesn't sounds like deiseling, but i guess it could be. it just keeps running if nothing has happened. the only other odd thing is that around the same time it started happening i got a nasty exhaust leak or something because it is suddenly really loud...but i've yet to find the big rust hole i expected to find. any ideas? cheers droo
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one foot on jacob's ladder, one foot in the fire. -- johnny cash |
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#2 |
Fat Fendered Fleetside
Join Date: Nov 2004
Location: WPB, S. FL, USA, Earth
Posts: 718
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Re: engine won't stop
check your pcv valve
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71 GMC lwb 56 Big window swb 93 GMC Sonoma (dd) radiused fiberglass fender project for 67-72 |
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#3 | |
Registered User
Join Date: Jun 2005
Location: La Honda, CA
Posts: 15
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Re: engine won't stop
Quote:
cheers droo
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one foot on jacob's ladder, one foot in the fire. -- johnny cash |
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#4 |
Boondock Saint
Join Date: Mar 2006
Location: Santa Ana
Posts: 80
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Re: engine won't stop
i had the same problem about 2 years ago, right after i first got my truck. the valve cover gaskets were all bad, and i was losing oil on the passenger side over the manifold. apparently i had gotten so much oil on the starter, it shorted out and the truck wouldnt stop. doesnt quite sound like your problem, but just my .02 cents worth.
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#5 |
Senior Member
Join Date: Jun 2006
Location: Arkansas
Posts: 227
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Re: engine won't stop
Your problem lies with the ignition and/or fuel. Back the timing off a couple of degrees and I'll bet your trouble goes away. You may not be able to hear the pinging found with a detonation or "spark knock" situation but you are certainly doing the valve seats and psitons no good whatsoever. You probably ought to look in to a little higher octane fuel as well if you decide not to change the timing. With the warmer temps and poor quality of fuel, detonation is prevalent and almost certainly what's going on. JMHO, Dean
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#6 | |
Registered User
Join Date: Jun 2005
Location: La Honda, CA
Posts: 15
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Re: engine won't stop
Quote:
sorry, this is my dump runner truck, and i've been too cheap to buy a workshop manual =)
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one foot on jacob's ladder, one foot in the fire. -- johnny cash |
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#7 |
Registered User
Join Date: Jun 2002
Location: central pa
Posts: 1,525
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Re: engine won't stop
It really sounds lile the starter selonoid is shorting the starting circuit. Check the exhaust where it connects to the passenger side manifold. If the leak is there it could have over heated the selonoid. Too much fuel would cause the BBC to shake and studder but with no electric to sparks it will eventually stop. My bet is shorted power to Dizzy it will just leep running.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne |
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#8 |
Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,269
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Re: engine won't stop
Turn it off while in gear--does it now stop?
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#9 |
Junior Member
Join Date: May 2006
Location: Peninsula, Oh
Posts: 197
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Re: engine won't stop
try disconnecting the plug on your alternator. Some times the ignition can be supplied with just enough power from the field of your alternator to keep it running with out the ignition switch on. A simple diode would fix this problem.
Graham
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#10 | |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: engine won't stop
Quote:
Have you tried this yet. I have seen this happen.
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#11 | |
Registered User
Join Date: Jun 2005
Location: La Honda, CA
Posts: 15
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Re: engine won't stop
Quote:
thx
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one foot on jacob's ladder, one foot in the fire. -- johnny cash |
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#12 |
Senior Member
Join Date: Jun 2006
Location: Arkansas
Posts: 227
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Re: engine won't stop
Back to the previous post... If you shut the truck off in gear with the engine running, does it die ? If so I'll stick to my original assumption of too much advance timing. All of the other answers are certainly very viable and could be your problem. I'd start with the timing first because it's simple to fix and doesn't cost anything. Good luck, Dean
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#13 | |
Registered User
Join Date: Jun 2005
Location: La Honda, CA
Posts: 15
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Re: engine won't stop
Quote:
in gear it does not stop. i have to stall the truck out to stop it. haven't had a chance to rotate the dizzy yet.
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one foot on jacob's ladder, one foot in the fire. -- johnny cash |
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#14 |
Senior Member
Join Date: Jun 2006
Location: Arkansas
Posts: 227
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Re: engine won't stop
what do you mean when you say you " have to stall the truck out " ? It's running , in gear and you shut the switch off and it dies ? My money says it's timing if this is the case. Dean
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#15 | |
Registered User
Join Date: Jun 2005
Location: La Honda, CA
Posts: 15
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Re: engine won't stop
Quote:
it's a manual 4 on the floor and if it's in gear and my foot is pressing on the clutch it will not die when i shut the switch off. if it's in gear, foot off the clutch, and the truck is moving, or in 1st, it will not die when i shut the switch off (it will keep going or start going). when it dies in gear it has nothing to do with switching the ignition. i come to a stop, put it in 2nd let off the clutch while holding the brake, and then it stalls out. i tried pulling the plug on the alternator, that did nothing. i tried to turn the dizzy, but couldn't figure out where the heck you loosen it up...my engine bay is dark and dirty so it doesn't make it easy =)
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one foot on jacob's ladder, one foot in the fire. -- johnny cash |
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#16 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: engine won't stop
do you have an electric fan by chance?
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#17 | |
Registered User
Join Date: Jun 2005
Location: La Honda, CA
Posts: 15
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Re: engine won't stop
Quote:
i think i may just throw in the towel and take it to a shop, since i know i don't want to fix the exaust problem, and i'd rather be working on my motorcycle =)
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one foot on jacob's ladder, one foot in the fire. -- johnny cash |
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#18 |
Fat Fendered Fleetside
Join Date: Nov 2004
Location: WPB, S. FL, USA, Earth
Posts: 718
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Re: engine won't stop
I don't know why I didn't think of it, but it certianly could be your timing.
There is a little piece of metal(bracket) attached to your intake (iirc) with a bolt, this bolt holds down a little metal tab or bracket that hold the Dist. in place. Loosen this bolt and you'll be able to rotate the dist. I know this is a picture of a furd dist. ( right now I'm not where my truck is...) but the tab will look something like this: ![]() but will be on the back of your engine(durn furds) and as you said, might be under a bit of greasy oily sludge! I'd reccomend getting a timing light, for only a little money, it can save you lots of headaches! |M|
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71 GMC lwb 56 Big window swb 93 GMC Sonoma (dd) radiused fiberglass fender project for 67-72 |
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#19 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: engine won't stop
Many of you are thinking it is dieseling, but in fact, it sounds to me like it is still running like normal.
Unplug the ignition switch on the back side of the dash. You'll probably need a small screwdriver, maybe even 2. It is somewhat common for the terminals to get all messed up and arc across. There is a chance that your problem is in there, if it all looks good, i would replace the ignition switch. |
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#20 |
Car Knocker
Join Date: May 2001
Location: jefferson,arkansas
Posts: 664
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Re: engine won't stop
Turn the radio on!
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68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit. |
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#21 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: engine won't stop
Hmm....
I had the same problem on my '68 in highschool and it was in fact the ignition switch. I agree that even though you replaced it, there could still be a wiring problem causing this. It would have to be quite of bit of dieseling to make the truck take off in 1st gear. Also, if it were a timing problem. Wouldn't you want to advance the timing? After all, isn't diesel combustion without spark? It's been my experience that my truck would only diesel if it was to retarded. Then again, I could be wrong. Just my .2 cents. Good luck! Last edited by bryanw1968; 07-28-2006 at 06:22 PM. |
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#22 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: engine won't stop
advancing causes dieseling.
And the engine actually runs backwards when it does that, so when he lets out the clutch in first, he'd go backwards. |
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#23 |
Registered User
Join Date: Jun 2005
Location: La Honda, CA
Posts: 15
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Re: engine won't stop
well, get this, i took it to a shop, they spent two hours trying to figure it out then then called and told me it was the switch, i told them i had just replaced it and i was about 99.99999% sure it was not the switch. at that point they said, well we'll only bill you an hour, we can't figure it out.
so i get the truck, go to home depot to get some stuff, crawl under the truck since the parking lot is much nicer than my gravel driveway, and staring right at me is the battery cable going to the starter which has worked it's way loose and is firmly resting on the post for the little yellow wire. along with that is the hole in my exhaust manifold...pointing right at the starter...which i had also just replaced like 3 months ago...doh! so it turns out my louder exhaust and non-stopping symptoms are related. the shop had figured out the manifold leak, but wanted $1200 to fix it and my rusty exhaust. i don't really care about the rest of the exhaust, but they wanted $500 for just the manifold part! which seemed a bit steep to me, considering this one is $90... http://www.manestruckparts.com/store...Category_ID=26 anyway, once again the "professionals" have left me with a bad impression. i guess if you can't plug a computer into it and get a diagnostic code, it's just too "hard" to figure out. thanks for everyones help. the first time i looked under at the start i just didn't see it. since i thought i was looking at a cheap exhaust fix i thought it would be something simple a shop could fix...guess i over estimated them. if anyone has a clean passenger side manifold that would fit a 69' 396 big block, drop me a line. cheers droo
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one foot on jacob's ladder, one foot in the fire. -- johnny cash |
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