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Would like to start diagnosing a problem with my 3126 using
Would like to start diagnosing a problem with my 3126 using cat man … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
2001 Peterbilt 3126 Cat Engine, no start condition also
2001 Peterbilt 3126 Cat Engine , no start condition also diagnostic tool won't communicate with ECM… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,737 satisfied customers
I have 2000 FL 70 with a cat 3126 and Eaton autoshift tCNNhe
Hello I have 2000 FL 70 with a cat 3126 and Eaton autoshift tCNNhe truck only has 60,000 miles I bought the truck a year ago and have problems with the transmission. Had it towed into Freightliner and… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
431 satisfied customers
I have this 2004 isuzu FRR, 7.8 with alisson auto tranny.
Hello I have this 2004 isuzu FRR, 7.8 with alisson auto tranny. This morning the check transmission light came on. No changes in how it works though. Checked the fluid, looks clean and on level. Could… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
431 satisfied customers
I have a 2008 Ford F750 truck with a CAT C7 engine. I would
I have a 2008 Ford F750 truck with a CAT C7 engine. I would like to swap it to a 3126 CAT engine. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
I have a 2001 Gmc t6500 with cat 3126. They are the gm
I have a 2001 Gmc t6500 with cat 3126. They are the gm version of the isuzu NQR. The truck doesnt want to move at all. The check trans light will not come on. I feel as tho the transmission must not b… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
431 satisfied customers
2003 f650 3126 cat died wont start check engine light does
2003 f650 3126 cat died wont start check engine light does not come on now communication with cat et, have power and ground to ecm and ignition hot on pin 70, replaced ecm with reman from cat still ca… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
I have a 2003 GMC 7500 with a 3126 cat, truck came in no
Hello, I have a 2003 GMC 7500 with a 3126 cat, truck came in no start no crank, could not communicate with ecm, checked power and grounds found all ok, replace ecm, now I can communicate with ecm and … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
I have 2004 Frieghtliner m2 cat engine c7 I replaced the
Hi I have 2004 Frieghtliner m2 cat engine c7 I replaced the engine to 3126 it's running perfect but the speed odemetor and the oil prusure is not working also the temp show high temp show high … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 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
Vocational, Technical or Trade Scho
10,245 satisfied customers
I am a business owner looking to buy a 2001 Freightliner single
I am a business owner looking to buy a 2001 Freightliner single axle tractor with a 3126 CAT @ 230 HP with Allison Auto with 260,000 miles. Is this a good engine and transmission? Is the mileage OK. W… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
I looked at a 2000 f750 dump truck today....it has 3126 cat
I looked at a 2000 f750 dump truck today....it has 3126 cat ...im thinkin of buying the truck the current owner did tell me it had an oil leak...but he still ran the truck that way and he said hed jus… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
I swapped out a c7 serial # ***** and installed a 3126 serial
I swapped out a c7 serial # ***** and installed a 3126 serial # ***** I put all the c7 sensors on the 3126 (plugged right in). the truck turns over but wont fire/start. any suggestions?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
I have a 2000 gmc c7500 with a 3126 cat in it. We hooked a
I have a 2000 gmc c7500 with a 3126 cat in it. We hooked a Cat Et up to it this evening with the right adapter I assume...7x-1714. The Cat et program says 1 ECM detected...initializing but not does an… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
2003 GMC c6500 runs fine, no communication on data link. CAT
2003 GMC c6500 runs fine, no communication on data link. CAT 3126, Allison auto, hydraulic abs. I use both nexiq USB link or CAT adapter II with all OEM softwares. My equipment connects to every other… read more
Travis A. Wells
Travis A. Wells
Truck Mechanic
Associates of Applied Science
15 satisfied customers
2000 GMC topkick with a 3126 cat engine. Shut off while running,
2000 GMC topkick with a 3126 cat engine. Shut off while running, will not restart. Checked voltage to ecm. 12 volts to pins 52 an 53 .I have 1200 psi. pressure in high pressure manifold while cranking… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
HI GUY,S my question is my 3126 cat motor is vibrating and
HI GUY,S my question is my 3126 cat motor is vibrating and a little slugish at take off.it surges while exelerating.any w3ay i did the fuel regulator and that helped a lot the cat man said there was a… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
thank you i can imagine that is probably the case ... now
thank you i can imagine that is probably the case ... now if the presure regulator is good .. should the fuel presure flucuate between 65 and 85 or be at a steady presure?also as far as you can tell f… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,245 satisfied customers
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Daniel Wilson

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Chris (aka-Moose)

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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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