Brampton, Canada

#22 Sep 28, 2012
micah dove wrote:
My 2000 cat engine3126 starts idles and usually runs fine but lately when accelerating after shifting gears, the rpms will jump almost like its slipping or skipping. And now it's starting to shutter or shake when accelerating. What do u think
i have same problem, cannot pass 80kmh easy and starts to shake, shutter, and sometimes little white smoke, it is hard to get to 90 or 100kmh, i replaced the huei pump, speed timing sensor, fuel pressure regulator, and iac. this is my mechanic telling me all this and now is the injectors, my recommendation is to get the injectors out and test out and if any is bad replaced it, be careful tjis trucks are a pain in the nuts

Plymouth Meeting, PA

#23 Sep 29, 2012
i have a 3116 cat in my tow truck can i switch to a 3126 in a school bus can get whole bus with 170,000 miles for 2000 dollars
J Morgan Flowers

Loxahatchee, FL

#24 Oct 7, 2012
Are there any CAT 3126 sensors (MAP, MAF etc..) that need to be cleaned to improve fuel economy and performance?
Eduardo Mendez

Charlotte, NC

#25 Dec 12, 2012
victor vargas wrote:
I have a truck with a 3126 cat engine that is giving me a hard time, it will start really good when the engine is cold but when the engine warms up and I turn it off it it won't start up again I have to wait till it cools down again.can u help please...
I have exactly the same problem with my roll back tow truck, the same 3126 cat engine on it. if someone can help, i ll really aprecciated.

Edmonton, Canada

#26 Dec 16, 2012
brandon wrote:
my 3126 cat will run fine at a idle but going down the road it will shut off like you turned the switch off but will crank back and go a little further and do it again what will cause it?
Try replacing the complete shut off valve it my be faulty

Potomac, MD

#27 Dec 17, 2012
f650 3126 starts and run fine until its warm-up for 10-15 min. then rpm goes up and down at idle rn rn rn, but if i press the gas it will run fine until idle agai. what can i do? thank you

Surrey, Canada

#28 Dec 25, 2012
I have a 1999 cat 3126, it start in the morning on first instant and shuts off after 10 sec, will start after 30 to 40 seconds of cranking. will run fine and starts up fine afterwards. Seems like there is air in line but cant find any fuel leak. Dyno done by Cat dealer no codes showing.Any help/suggestion.

Potomac, MD

#29 Jan 16, 2013
I have an f650 truck with a cat 3126 engine that starts and run ok until its warms-up for 10-15 min, then the rpm goes up and down at idle rn rn rn. if I press the gas it will run ok until I let it to idle again, then goes rn rn rn again. Can anyone help to tell me what I should? thank you a lot.
Otukoya lola


#30 Jan 28, 2013
clayton wrote:
you need to check for active codes. eg. eng position sensor, ecm voltage in ect.just had one where as both e.p.s had failed
on move he just stop
Otukoya lola


#31 Jan 28, 2013
Pls can u direct me to where and show the picture ro me the e.p.s

Sarasota, FL

#32 Mar 24, 2013
my 2003 cat 3126 has been smoking bad white blue smoke little slugish hard to start last time wants it gets going it runs ok is it the injecters not sure need help

Surrey, Canada

#33 May 11, 2013
I have a 1999 cat engine 3126 I've had nothing but trouble with it since i brought it & caterpillar has been no help, It is the last thing I'll ever buy from them. Its not even worth it's weight in scrap .

Montego Bay, Jamaica

#34 May 19, 2013
I have a 2000 cat engine3126 that fumes badly.
Does anybody have any idea what could cause this problem?
The engine is fearly new.
Victor Avelino

Newark, NJ

#36 Jun 29, 2013
I have a caterpillar engine that has problem to start...
when i start it,a lot of smoke come out. and then the engine shut down in a few seconds

Gilbert, AZ

#37 Aug 13, 2013
3126 that runs awhile then it feels like it loads up and loose's power after a few minutes it runs fine then it does it again after awhile
Denver towing

Denver, CO

#38 Sep 17, 2013
I have a gmc with the 3126 engine, just start with starter fluid, replace the fifth injector and O rings and still the same problem, after replacing the oil and try again works.


#41 Sep 19, 2013
freightliner medium duty with cat engine 3126 is having serious problem like,engine move fine when it cold but when it get hot engine speed reduce.however,engine does not smoke,but engine indicate check engine light and go off within a few seconds when is on high way and RPM will drop to 15 by steady press on throttle pedal,help us out.

Wethersfield, CT

#42 Oct 18, 2013
I have a CAT 3126 in my RV, it turns over but wont fire. there is fuel up to the filters anyone have any ideas?

United States

#46 Dec 17, 2013
I have a cat 3126 that won't turn off with the key. I have to disconnect the 2 main batteries to get it to turn off and when I reconnect the cable to the starter all my dash lights come on even with the key off?

United States

#47 Feb 1, 2014
Bought fl70 with 3126 removed shutdown system now truck won't crank turns over but won't crank and run unless u keep spraying either

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