620owner Posted June 12, 2018 Report Share Posted June 12, 2018 I'm getting a slight engine shake at shut off. Just swapped the tranny, wondering if I weakened a motor mount ? I don't think I have a broken motor mount, drives great but it just started this after the swap. Could it be something else ? 1 Quote Link to comment
nl320what Posted June 12, 2018 Report Share Posted June 12, 2018 Usually my 620s would wobble when shut off cause of dieseling alittle after swapping in a Weber without the fuel cutoff solenoid anymore. 1 Quote Link to comment
racerx Posted June 12, 2018 Report Share Posted June 12, 2018 Try put it in gear before shut off see what happens. 1 Quote Link to comment
Charlie69 Posted June 12, 2018 Report Share Posted June 12, 2018 Ad the fuel cut solenoid. https://www.piercemanifolds.com/searchresults.asp?Search=43928.060&Submit= This is fom Pierce Manifolds. 1 Quote Link to comment
620owner Posted June 12, 2018 Author Report Share Posted June 12, 2018 Running original, Hitachi Carb. Not acting like dieseling, just a little stumble/rock when killing the engine. Quote Link to comment
nl320what Posted June 12, 2018 Report Share Posted June 12, 2018 Not completely a diesel run-on, I know that shut-off shake/rattle/wobble all too well for that half second. Bad gas, vac leak, gunk in shut off solenoid maybe ? 1 Quote Link to comment
paradime Posted June 12, 2018 Report Share Posted June 12, 2018 So this is something it had not done before? It's definitely not the mounts though. They're designed to let engine wobble. Did you change the timing by any chance? beyond that, I'm with nl320what. Quote Link to comment
datzenmike Posted June 12, 2018 Report Share Posted June 12, 2018 Did you remove the engine when doing the trans? May have upset something. Check the idle cut is connected. It should make a clicking sound when the ignition is turned on/off/on/off. Did you change spark plugs? Did you replace thermostat? Are you using a different gas than normal? 1 Quote Link to comment
620owner Posted June 12, 2018 Author Report Share Posted June 12, 2018 No didn't remove engine. I'll check the idle cut. nl320what said bad gas.... come to think i'm running out a tank from last fall and it's down under 1/4 now. Didn't give that a thought. The truck sat over the winter with a full tank in the garage. I just swapped the tranny and started driving it again. I'll top it off with premium and see if that makes a difference. Quote Link to comment
datzenmike Posted June 12, 2018 Report Share Posted June 12, 2018 I'm getting a slight engine shake at shut off. Just swapped the tranny, wondering if I weakened a motor mount ? I don't think I have a broken motor mount, drives great but it just started this after the swap. Could it be something else ? I'll take that as not removing engine. Try the gas, you have to fill it up anyway. Quote Link to comment
Doctor510 Posted June 12, 2018 Report Share Posted June 12, 2018 Try put it in gear before shut off see what happens. AKA Clutch Kill 2 Quote Link to comment
flatcat19 Posted June 12, 2018 Report Share Posted June 12, 2018 Just be in the habit of using the clutch to kill the car. 2 Quote Link to comment
datzenmike Posted June 13, 2018 Report Share Posted June 13, 2018 Causes of engine 'run on' or 'dieseling' Idle too high for idle cut to have any effect. BCDD set incorrectly causing a fast idle. Idle cut stuck open, or insides removed or carb replaced with one that doesn't have one. Carb flooding, making the idle cut useless. If the idle is correct, carb not flooding and idle cut working there shouldn't be a problem. If you have an old carb without an idle cut, the following may cause run on... Engine running too hot. Spark plug range too hot Excessive carbon build up Compression too high / Too low an octane gas Quote Link to comment
captain720 Posted June 25, 2018 Report Share Posted June 25, 2018 Just be in the habit of using the clutch to kill the car. I got in the habit of doing this before I knew how to fix the dieseling so I can do it perfectly, now I have no idea if my trucks diesel or not because it's a habbit :) Quote Link to comment
distributorguy Posted June 25, 2018 Report Share Posted June 25, 2018 The most likely issue is bad gas, but also look for vacuum lines that don't fit tight or got damaged. Replace all that are brittle, hard, cracked, or don't fit very tight. Check that the vacuum unit on your distributor can hold a vacuum indefinitely. Re-torque intake and carb hardware. Quote Link to comment
racerx Posted June 25, 2018 Report Share Posted June 25, 2018 Also if the rpm at idle is a little high,it diesels. 1 Quote Link to comment
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