Engine run on, Don't know what else to try |
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Engine run on, Don't know what else to try |
oakdalecurtis |
Mar 5 2017, 05:47 AM
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#1
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Oakdalecurtis Group: Members Posts: 1,336 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California |
76 2.0, 120k miles, all stock engine parts except for Crane Ignition. Engine runs on after shutdown for 3 to 5 seconds. All engine parts working, thermostat, aux air regulator, no vacuum leaks, motor runs beautifully and pulls hard, engine idles after warmup at about 600 rpm. I tried adding a diode to the lead from the alternator to the generator light, that made no difference to stopping the run on after shutdown. Any other ideas to suggest that might fix it? (besides popping the clutch to stop the engine)
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rgalla9146 |
Mar 5 2017, 07:38 AM
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#2
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Advanced Member Group: Members Posts: 4,624 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None |
timing too advanced ?
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Shadowfax |
Mar 5 2017, 08:18 AM
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#3
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Show us the meaning of haste Group: Members Posts: 509 Joined: 19-January 15 Member No.: 18,340 Region Association: South East States |
Would running higher octane gas help?
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bretth |
Mar 5 2017, 09:36 AM
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#4
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Senior Member Group: Members Posts: 899 Joined: 23-June 15 From: Central TX Member No.: 18,882 Region Association: Southwest Region |
Did you change your tail lights recently? Using a single filament bulb instead of the correct dual filament can make the engine continue to run.
Edit - Never mind I just reread your post it only runs for '3 to 5 seconds'. I don't think the tail lights would affect this. |
TheCabinetmaker |
Mar 5 2017, 10:32 AM
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#5
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I drive my car everyday Group: Members Posts: 8,309 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
I second timing.
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oakdalecurtis |
Mar 5 2017, 11:00 AM
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#6
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Oakdalecurtis Group: Members Posts: 1,336 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California |
I removed the dizzy recently to install new trigger points. I did not loosen the adjustment bolt, only removed the hold down bolt to get the distributor out. But that may have altered the timing slightly non the less. I am taking the car in to a very good mechanic next week for it's required smog check, so I will ask him to check the timing before running it for smog. Thank you for your suggested solution.
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Krieger |
Mar 5 2017, 11:12 AM
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#7
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Advanced Member Group: Members Posts: 4,754 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None |
Ignition switch.
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stugray |
Mar 5 2017, 12:03 PM
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#8
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I disagree with the timing being the culprit.
If the ignition is OFF then the "sparks" should not be firing and it wouldn't matter where the timing is set. Another thing that can cause run-on (other than an electrical problem) is if the heads are way too hot. Do you have a temp sensor to tell you if the engine gets hot? Does it run-on after a very brief startup or only after a long drive? |
type2man |
Mar 5 2017, 12:59 PM
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#9
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Member Group: Members Posts: 355 Joined: 3-March 09 From: Miami, Fl Member No.: 10,127 Region Association: South East States |
I think I read something here a while back about the same issue and it turned out to be the Crane ignition.
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oakdalecurtis |
Mar 5 2017, 01:18 PM
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#10
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Oakdalecurtis Group: Members Posts: 1,336 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California |
It runs on even after short drives. The temp outside has been cool and I don't think the engine is running hot. Since I removed the rain tray the engine has been running cooler than ever. The cylinder and oil temps seem fine. Will check timing before smog check and go from there.
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Dave_Darling |
Mar 5 2017, 02:19 PM
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#11
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914 Idiot Group: Members Posts: 15,048 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Injected, right? In theory, all fuel should cut off instantly when the key is turned off. That means no run-on from ignition or hot-spots. You need fuel for run-on.
So, either you have a lot of fuel loaded up in the intake, or your FI is continuing to add fuel. I would suspect the ignition switch. Or maybe something else is feeding back into the ignition circuit? You'll want to isolate the problem. See if unplugging the trigger points or the four-pin plug at the relay board kills the engine. If so, you've got something continuing to power the fuel injection. --DD |
oakdalecurtis |
Mar 5 2017, 08:10 PM
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#12
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Oakdalecurtis Group: Members Posts: 1,336 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California |
Injected, right? In theory, all fuel should cut off instantly when the key is turned off. That means no run-on from ignition or hot-spots. You need fuel for run-on. So, either you have a lot of fuel loaded up in the intake, or your FI is continuing to add fuel. I would suspect the ignition switch. Or maybe something else is feeding back into the ignition circuit? You'll want to isolate the problem. See if unplugging the trigger points or the four-pin plug at the relay board kills the engine. If so, you've got something continuing to power the fuel injection. --DD Yes, FI. Dave, can you be more specific on location of 4 pin plug/relay board location you're referring to? Want to be sure I'm pulling the right thing to check, thanks. |
oakdalecurtis |
Mar 7 2017, 03:36 PM
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#13
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Oakdalecurtis Group: Members Posts: 1,336 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California |
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Dave_Darling |
Mar 7 2017, 03:51 PM
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#14
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914 Idiot Group: Members Posts: 15,048 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Bottom-right on your photo. (Left-rear as it shows in the car.) Four pins, white wires.
--DD |
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