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I have a 1999 Thomas School Bus with a Cat 3126. I recently
Second Opinion] I have a 1999 Thomas School Bus with a Cat 3126. I recently changed the fuel filters, a first for me. It started fine afterwards, just with a bit of a longer turnover (I used the 3-30s… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,195 satisfied customers
2000 freightliner C12 engine rpm limited to 1700rpm. CAT
2000 freightliner C12 engine rpm limited to 1700rpm … read more
Justin
Justin
Diesel Technician
Vocational, Technical or Trade School
9 satisfied customers
Do I need to worry about "air lock" when I do coolant flush
Do I need to worry about "air lock" when I do coolant flush on my 2003 Thomas Saf-T-Liner HDX?This is for the CAT 3126 you helped me with a few days ago. Also do you know where to drain it from? It so… read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
95 satisfied customers
Sorry, I X'd out by accident. Freightliner Model FL-70. VIN
sorry, I X'd out by accident. Freightliner Model FL-70. VIN - 1FUWHJBA3YHG02625 Engine, cat 3126 SER# ***** … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,195 satisfied customers
I have a 2000 CAT 3126 that idles @ 70 psi fuel pressure but
I have a 2000 CAT 3126 that idles @ 70 psi fuel pressure but when you come off idle it begins to drop and it will actually go to 0 psi under a load and the engine still runs ok at psi till it eventual… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have a 2000 Freightliner Fl 60. Runs fine at times but
I have a 2000 Freightliner Fl 60 . Runs fine at times but sometimes it struggles going up bills to a point where it cuts off while going up hill When I restart immediately the check engine light is of… read more
Joe Green
Joe Green
71 satisfied customers
We have a 1996 Kenworth T300 with a Cat 3126. Short on power
We have a 1996 Kenworth T300 with a Cat 3126. Short on power and always cranks does not always fire. Yet will fire on either and continue to run. Replaced the fuel nd water separator filters. … read more
Joel Bos
Joel Bos
909 satisfied customers
I have an fl80 3126B and it has no power nobody seems to
I have an fl80 3126B and it has no power nobody seems to find the problem. Everyday in the am when I go to work truck work ok but as soon as the truck gets to normal temp 180-200 it losses all power I… read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
I have a 1997 Freightliner FL80 Caterpillar 3126 7.2L, I
I have a 1997 Freightliner FL80 Caterpillar 3126 7.2L, I need the location of the coolant temperature sensors, there's 4 of them.… read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
I have a 95 freightliner with a 3126 cat motor it kept
I have a 95 freightliner with a 3126 cat motor it kept shutting off so we replaced the computer to it to caterpillar and they programmed it and it runs a min a still shuts off caterpillar sayd it isn'… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,195 satisfied customers
2001 FL80 FREIGHTLINER NO DAY TIME RUNNING LIGHTS ON RH
2001 FL80 FREIGHTLINER NO DAY TIME RUNNING LIGHTS ON RH SIDE. TURN ON THE LIGHS AND IT ALL WORKS FINE. HIGH AND LOW BEAM … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,195 satisfied customers
2000 FL80 150000K 3126 CAT I suspect the injector cup orings
2000 FL80 150000K 3126 CAT I suspect the injector cup orings have failed. Coolant is contaminated with fuel and bleeding out the overflow. What other issues need to be looked at, such as flushing the … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
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I had front structure of cat 3126 re sealed, crank seal re
I had front structure of cat 3126 re sealed, crank seal re sealed, oil pan, oil cooler re sealed, cam followers, and oil filter housing replaced at dealer. Drove the truck about 3-5 miles and the cran… read more
Eddy
Eddy
HD Truck Tech
GED
2 satisfied customers
98 Fl80 Freightliner. I replaced a cummins with a 3126 cat
98 Fl80 Freightliner. I replaced a cummins with a 3126 cat engine and harness. Cat engine is from a 2000 fl80. I have no power at pins 52 and 53. These two wires become one in the harness. wire number… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,195 satisfied customers
I have a 99 Freightliner FL 80 with a cat 3126. It is acting
Hi, I have a 99 Freightliner FL 80 with a cat 3126. It is acting like it is running out of fuel. I have replaced the filter, and have checked it several times. One time, the filter was only half full.… read more
FIX-IT
FIX-IT
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Vocational, Technical or Trade Scho
829 satisfied customers
Fl 80 freightliner wont idle up with cruise ecm says brake
Fl 80 freightliner wont idle up with cruise ecm says brake switch is on … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have a 2000 Freightliner with a 3126 Cat motor in it. I
I have a 2000 Freightliner with a 3126 Cat motor in it. I think we had a freeze up about a week ago and then started the truck. The heater was not putting out warm air so I know there was a problem. i… read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
We have a 2003 Freightliner FL80 w/ CAT 3126. It has been
We have a 2003 Freightliner FL80 w/ CAT 3126. It has been having an intermittent sputtering or cutting out problem when seeing a load. It doesn't throw any codes for this. Dealer changed fuel pressure… read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

6,195 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

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I am ASE Master Truck Certified.

Wayne

Wayne

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worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

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ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

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cumminsdr

cumminsdr

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All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

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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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