Mack e7 rough idle. Its got 300k or so miles on it.

Mack e7 rough idle Truck has a ruff idle and with tack out. 98 ch613 with a E7-427 (remanufactered by Mack in 2008) has about 150,000 miles on the engine. In most cases, the rough idling in the Mack E7 E-TECH engine is caused by electronic components. 400-500 rpm at idle. and occasionally stumble and miss in the low gears taking off easy from a stop when it would miss it would either blow white smoke that smelled of raw fuel or thick black smoke. Anyway, idles fine when cold, kinda rough when hot, real rough after getting off expressway. The owner just replaced the throttle assembly but still no difference. Oct 29, 2009 · I'm currently working on a Mack E7-300, and for some reason it has a surging idle, hot or cold, it's a V-Mack 1. I measured the sleeve height from the deck and they all checked out. Rough idling is also a common problem in this engine. For rough idle and tach issues on the CH6 with an E7 engine, inspect the injection pump thoroughly. New pump and injectors. Jul 3, 2015 · By the way, no one knows jack-diddly about a mack in my neck of the woods other than the "stealership" an hour away! Would love to correct the problem myself or using my local guys with some knowledge from any of you. the truck came to my shop not running. Common Mack Engine Problems and How to Fix Them Mack truck engines are tough, but EGR, turbo, and injector issues can cause costly repairs. Jan 9, 2025 · The first issue found in the Mack E7 is rough idling, which is very common among these engines. through some tests I determined the injection pump to be faulty and thus had it redone. White smoke and poor fuel delivery suggest a faulty or improperly calibrated injection pump. Or at least that's what they said they did. If you start it up frist thing in the morning it runs rough and smokes white for about 30 or 40 secounds and has no throtle respones, but it will run like this for just a bit and then runs fine, untill yo Apr 26, 2018 · I have a 2000 ch with an e tech 460 that recently blew a head gasket. Its got 300k or so miles on it. I replaced the gaskets under both heads and swapped heads front to rear. just sitting if you give it throtle it gets up to like 1500 rpms and starts sputering and blowing white smoke. it clears out normally by the first shift or two and runs Mechanic's Assistant chat Customer: My Mack E7 sputters and misses when I let it idle, but it clears up normally by the first shift or two and runs fine afterward. Apr 12, 2019 · This is a do over from a past post. Compression overcame the fire ring and cut through the fiber gasket. Runs perfect at startup but after warm up and driving it has a misfire at idle and pops smoke. This engine has a mechanical injection pump and mechanical injectors. if you rev the engin Jan 3, 2018 · I know it's been a couple of years but I have the same problem on a 2000 E7-460. Any help would be appreciated Sep 4, 2012 · Hey everyone this is my frist post and i was wordering if my 98 e7 454 has a problem or not. Mack e7 sputters/ misses when you let it idle than take off. Pressure checked air cooler and hoses, ok. I decided to swa Sep 2, 2021 · '99 MACK RD688S, E7 ENGINE W/ VMAC III LOW POWER PROBLEMS Monkeywithawrench Sep 1, 2021 Jan 9, 2025 · The fuel received is too much so it can’t be burned by the allowed air in the cylinder which leads to incomplete combustion. Could there be an adjustment on the pump or something thats out? Jan 25, 2016 · Our rd is idling low its a e7 450, 1998 year. Installed used 1995 E7 semi electric motor and new injection pump on ch6 Mack. Rough idle in the Mack E7 400 can stem from fuel injector problems, air intake leaks, or faulty sensors like the MAP or TPS. Jun 10, 2013 · im trying to repair a 97 ch600 with an e7 engine. Oct 31, 2019 · Fuel pressure at idle 68psi, at 1400+ rpm's 76psi. Also did a complete service on the engine. Jan 13, 2008 · Just to update, my intermittent idle problem completely went away after my local KW/Mack dealer did a top end adjustment of the valves and injectors. Base engine oil pressure at idle cold 60+ psi, hot at idle 22+ psi. Mar 22, 2007 · At work we have a 97 E7 mechanical and shes not runing too good. Apr 2, 2011 · started out that the truck would occasionally idle pretty rough esp when hot. Mar 8, 2018 · 02 Mack E7 shutting off while idling Discussion in ' Heavy Duty Diesel Truck Mechanics Forum ' started by 704mover, Jan 29, 2019. I also rebuilt the econovance. Prevent downtime with regular maintenance and early diagnostics. 1995 Mack CH6 E7 Engine Rough Idle and Tach Issues CH6 often faces rough idle and tachometer fluctuations linked to fuel delivery inconsistencies. Start by inspecting injectors for clogging or leaks. after reassembly the engine has a mean hunt between 600 and 900 rpm. would come out of it by 6th gear and seem to run ok. Visually checked engine wiring harness and also wiggle tested some of the dash harness while the truck was driven by another driver. ufv gzjojd snngspzx qyvmhjw xrq sbka nspka zcx muhz olmu tplftbq okk wroh tgbg adqz