acesneights1 Posted June 12, 2016 Share Posted June 12, 2016 Have an ENDT 673 and today it started not idling. It idles fine until I drive it down the road then it won't return to idle. It gets stuck between 8-1000 rpms. If i snap the Pedal(fuel) a couple times it will idle normal again around 550 rpms. If I drive easy and don't give it more than half throttle it won't do it. Could this be the governor coming apart? I check all the linkage and there is no binding and I have pulled over when the truck is idling high and the throttle lever on the Inj pump is against the stop. f i try to lift up on the fuel pedal, nothing changes. The only way to get it to idle normal is snap the pedal a few times or shut the truck off and re start it. Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/ Share on other sites More sharing options...
fjh Posted June 12, 2016 Share Posted June 12, 2016 Try some fuel conditioner howes standyne or seafoam conditioner Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-336262 Share on other sites More sharing options...
theakerstwo Posted June 12, 2016 Share Posted June 12, 2016 Sounds like a binding rack.Like been said load it up with fuel adtive. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-336274 Share on other sites More sharing options...
1965 Posted June 12, 2016 Share Posted June 12, 2016 Transmission fluid works well too i was told that today's fuel doesn't have enough lubricant for the older engines Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-336287 Share on other sites More sharing options...
acesneights1 Posted June 12, 2016 Author Share Posted June 12, 2016 Thanks. Oddly enough I jut put standyne additive in and it started right after that . Would 2 stroke oil work ? I use that on the GM 6.2/5s and the Dodge guys use it on the VP pumps. Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-336320 Share on other sites More sharing options...
1965 Posted June 12, 2016 Share Posted June 12, 2016 Yea Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-336329 Share on other sites More sharing options...
acesneights1 Posted June 20, 2016 Author Share Posted June 20, 2016 Update. Dumped 3 quarts 2 stroke, a big bottle of standyne additive , a bottle of Lucas and 2 bottles of sea foam. No improvement . Is the IP toast ? Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-337208 Share on other sites More sharing options...
fjh Posted June 20, 2016 Share Posted June 20, 2016 Sounds pretty much the case see if you can find a good used or have it repaired by a fuel shop in your area! Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-337220 Share on other sites More sharing options...
acesneights1 Posted June 21, 2016 Author Share Posted June 21, 2016 How difficult is it to change ? How is it timed ? Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-337300 Share on other sites More sharing options...
fjh Posted June 21, 2016 Share Posted June 21, 2016 (edited) it is a master spline or tab drive depending on the age! you cant get it out of time unless you force it! three or four bolts and the lines and whet ever else is in the way and you off! Edited June 21, 2016 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-337303 Share on other sites More sharing options...
fjh Posted June 21, 2016 Share Posted June 21, 2016 you got a huge job ahead getting fenders and stuff out of the way! That engine is likley tang or tab driven it also has a master dowel 1 Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-337304 Share on other sites More sharing options...
acesneights1 Posted June 21, 2016 Author Share Posted June 21, 2016 Ok that's what I wasn't sure. I know I watched a guy do a Mack years ago and he used some sort of degree wheel on the crank. Fenders come off pretty easy . It looks like the power steering pump and air compressor all have to come off too. ughhh...what am I looking at to remain this pump $$? Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-337311 Share on other sites More sharing options...
acesneights1 Posted July 8, 2016 Author Share Posted July 8, 2016 Ok, dodged a bullet. In case this symptom happens to anyone else. basically the splined shaft coming out of the IP was skipping. The lever was just loose enough that when you gave the truck more than half throttle it would skip a spline then would idle high because the lever was hitting the forward adj. if I "snapped" the pedal hard the splined shaft would actually skip back. I clocked it and tightened it.. Problem solved. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-338761 Share on other sites More sharing options...
j hancock Posted July 8, 2016 Share Posted July 8, 2016 Thanks for updating with your results. Keeping that bolt tight is sure less money than a pump rebuild. 2 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-338764 Share on other sites More sharing options...
fjh Posted July 8, 2016 Share Posted July 8, 2016 Yup good find cheap fixes are good 1 Quote Link to comment https://www.bigmacktrucks.com/topic/45611-engine-wont-idle-bad-inj-pump/#findComment-338780 Share on other sites More sharing options...
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