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Cat 3126E just died now no start condition,, just replace #1
Cat 3126E just died now no start condition,, just replace #1 and #4 injector orings as they were leaking oil out the top oring, truck fired up and ran good, on the test drive truck just died, stop eng… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
Check engine lite comes on at operating temp for fuel
check engine lite comes on at operating temp for fuel pressure low pid 94 fmi1.when i come to a traffic lite sometimes this happes … read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
Marine 3126B and when running at 2500+ For 5-10 minutes it
Marine 3126B and when running at 2500+ For 5-10 minutes it blows the gasket on the secondary fuel filter. No issues at a lower rpm. Could it be just a bad filter?… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
2000 GMC Topkick with 3126 Cat will not start without ether.
2000 GMC Topkick with 3126 Cat will not start without ether. Seems ok once its running but if you slow down to stop it will die and will not restart without ether. Replace the fuel pressure regulator … read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
I have a 2001 cat 3126 in a fl70 box truck with 276,000
i have a 2001 cat 3126 in a fl70 box truck with 276,000 miles the flash codes are 39 15 49 12 61 69. It starts up then the engine protect light comes on and shuts the motor down. I cleaned all connect… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
We have a c8500 with a cat 3126 motor. Engine will turn over
We have a c8500 with a cat 3126 motor. Engine will turn over but will not start. Changed the oil pressure sensor. Did not help … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
3,017 satisfied customers
I was hoping to speak with cat man about an engine im
hello. i was hoping to speak with cat man about an engine im working on … read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
Cat 3126 sluggish when cold running fine as soon as t
cat 3126 sluggish when cold running fine as soon as t reaches 150 temp it wakes up any clues no codes… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
2002 business class with cat. loses fuel to injectors when
2002 business class with cat. loses fuel to injectors when driving at low rpms. Mostly when deceleration going down hill. … read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
What 3126 cat engines will swap with a c7acert in a 2007
What 3126 cat engines will swap with a c7acert in a 2007 freightliner M2, 280 hp? I understand the 3126 is more durable.… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
I have a 1999 GMCc8500 with cat 3126 speedo and tach are not
I have a 1999 GMCc8500 with cat 3126 speedo and tach are not working. Looking for wiring diagrams and possible causes… read more
Jr Gilliam
Jr Gilliam
Diesel Technology
1 satisfied customers
I have a 2004 freightliner business class with a cat 3126 motor.
I have a 2004 freightliner business class with a cat 3126 motor. Truck has no power especially when loaded. When it gets hot some times it will not start. Once the motor is cold it fires right up. We … read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
Have a 2005 freightliner with a 3126 cat motor, cranks but
Have a 2005 freightliner with a 3126 cat motor, cranks but wo't start ihave 2 active codes pid 164 fmi3 injection actuater pressure and pid110 fmi 3 coolant temp voltage high. I am not even showing th… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
MR. CAT-MAN...PRE EXISITING CONDITION: HELP PLEASE!! We
MR. CAT-MAN...PRE EXISITING CONDITION: HELP PLEASE!! We thought we had this truck properly repaired, only to find out that the unit is acting the same way as before! 2002 Caterpillar C7 3126 7.2 liter… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
Mr CAT Man, 2002 Caterpillar C7 3126 7.2 liter Engine Engine
Mr CAT Man, 2002 Caterpillar C7 3126 7.2 liter Engine Engine Serial Number: C7KM44559 COMPLAINT: Of the mornings truck has plenty of power, runs great. The longer the day goes by making deliveries,the… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
3126 cat 1998. Went on vacation. Live at about 300 ft above
3126 cat 1998. Went on vacation. Live at about 300 ft above sea level. We took the motor home to about 9000 ft. Stayed a few days. Motorhome was parked for5 days. Day 6 we took the motorhome towing ou… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
Have a Cat 3126/C7 in a 2004 Ford f650 super duty flatbed tow
Have a Cat 3126/C7 in a 2004 Ford f650 super duty flatbed tow truck. Engine serial no. is HEP33849. Truck has 176,000 miles. Engine ran and started great until I did routine maintenance. Changed oil a… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 satisfied customers
3126 cat need to ck compression need tool # XXXXX you help. 2000
3126 cat need to ck compression need tool # XXXXX you help. 2000 model gmc 3126 installed new and reprogramed computor ,got rid of injector short codes and then replaced all six injectors still no sta… read more
Cat Man
Cat Man
Cat Engine Expert
9,561 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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