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Related Medium and Heavy Trucks Questions
I have a 3126. I have replaced the heui pump and injectors
I have a 3126. I have replaced the heui pump and injectors also the iap sensor. When I run actuation pressure test and raise the pressure to max output it only reaches 2400 psi. Engine also makes a hu… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,563 satisfied customers
99 3126 cat no start. 99 Harney RV 3126 Cat. I am fixing
I am fixing myself. Ran fine month ago, no start changed fuel filters, no start. Got flash codes 15 and 17 changed out iprv now will hit but not start. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
Cat 3126 have to crank forever to start, onece running skips
cat 3126 have to crank forever to start, onece running skips for a few minutes then is fine for rest of day. Can shut off and will fire right back up, replaced crank sensors, checked valve at back of … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
I have a 2002 f750 with a 3126e cat ser #ckm35557, have had
I have a 2002 f750 with a 3126e cat ser #ckm35557, have had this truck for one year, I have put all new fulids and filters at the start of winter plowed for a totaled 84 hrs this season with no probbl… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
Been working on a 3126. Previous question was having fuel
Hi, Been working on a 3126. Previous question was having fuel pressure issues. Got the kinks worked out of that. Still having a missfire condition though. Ran a injection activation preasure test. At … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
I HAVE A 1998 CHEVY 6500 WITH 3126 CAT IT QUIT GOING DOWN
I HAVE A 1998 CHEVY 6500 WITH 3126 CAT IT QUIT GOING DOWN THE ROAD HAS A FMI 11 CODE CRANKS OVER OK DID NOT SEEM TO HAVE OIL PRESSURE IN HEAD I DID NOT HAVE A GUAGE TO CHECK REMOVED IPR VALVE AND CHEC… read more
Cat Man
Cat Man
Cat Engine Expert
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10,303 satisfied customers
I have a 1999 cat 3126 that had starting and running
Hi. I have a 1999 cat 3126 that had starting and running problems 8 months ago I changed primer pump iap valve engine speed sensor all injector o-rings and the heui pump that finally went out all toge… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
I have a Cat 3126 in a Freightliner truck with 350,000 miles
I have a Cat 3126 in a Freightliner truck with 350,000 miles on the clock. I think I have a bad HEUI pump but I'am not sure how to test it. Also, while cranking the truck [it wont start] I'm noticing … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
I have a 2001 cat 3126 ser no. 8yl74019 Starts fine runs
I have a 2001 cat 3126 ser no. 8yl74019 Starts fine runs great until up to Temperature,then will stall in will not restart without ether Then when it does start You have to use You have to keep foot o… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
L change the injectors cup on c7 and l get code 6h 164 sid
l change the injectors cup on c7 and l get code 6h 164 sid 022 the truck is freightliner m2 they roan whit starter fluid but if l turn off they not roan again at lease if l put mor stater fuid estart … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
I have a 3126 7LZ741 with error code 164-00. IAP is over
Hi I have a 3126 7LZ741 with error code 164-00. IAP is over 4000 PSI with Manometer and with CAT ET. I change the IAP Valve, same problem, I checked the IAP VALVE-ECM Circuit there was continuity with… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
Cat c7 serial #71176 wont run will start with ipr unplugged
cat c7 serial #71176 wont run will start with ipr unplugged and a shot of either dies out when i plug in the ipr new heui pump… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
I have a CAT 3126B. I had a no start issue where it would turn
I have a CAT 3126B. I had a no start issue where it would turn over but not fire up. I had 0 PSI on the dash oil pressure guage so I ended up replacing the oil filter and swapped in a salvage oil pump… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
i am trying to diagnose a 2005 f-750 with a cat C-7 i have
i am trying to diagnose a 2005 f-750 with a cat C-7 i have replaced the IAP sensor all of the injectors report back ok with a cutout test i cant see a any abnormal amounts of oil leaking/squirting fro… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
Working on a Caterpillar 3126 (eng# *****). Getting a code
Working on a Caterpillar 3126 (eng# *****). Getting a code 164-2 (Injection actuation pressure signal erratic). New actuation pressure sensor and new engine harness from ecm to sensors. Can you point … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
I have a 2000 F750 w/ a 3126 cat. It has a no start condition.
I have a 2000 F750 w/ a 3126 cat. It has a no start condition. I tested the hp oil, it has about 500 psi w/ cranking… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
I am working on a 3126 and getting a fault code for high pressure
I am working on a 3126 and getting a fault code for high pressure oil readings being erratic. Using Prolink IQ monitored pressure on a test drive and pressures were running around 800 to a 1000 psi lo… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
02 DT466 WHAT IS THE MIN PRESSURE TO START WHILE CRANKING OVER
02 DT466 WHAT IS THE MIN PRESSURE TO START WHILE CRANKING OVER ON THE HEUI PUMP AND MECHANICAL FUEL PUMP… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,303 satisfied customers
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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