Engine/Transmission (1998.5 - 2002) 2001 HO questions!!!

[RJMurphy]

****Sorry Search down****

Looking at a 1991 Quadcab longbed 2wd HO 6 speed truck with ~30,000 miles. Are there any problem areas I should look at? Any specifc problems with this model? Sold my first gen crewcab, and looking for something newer. Thanks in advance. Murfman

 

[dresslered]

murfman-

I'm sure other's will chime in with various other problems, but the main recurring problem has been with the lift pump. They are real easy to replace, however, if the truck has been driven with a bad one for quite some time, the injection ($$$) pump may have seen some extra wear (both these items fall under the 100k warrantee try to prevent the problem before it happens). Take a pressure reading at WOT and enjoy. Mine has been a great truck!

 

[Ted Constantine]

pretty much the normal 24v issues. Lift pump. 4x4s have track bar and steering issue potential but you are looking at a 2wd right? Probably not a 1991 quad cab ho though but I am just guessing The only difference, "functionally" from the standard output is the higher compression ratio makes the EGTs a little higher. They also bomb a little differently, bigger increases out of injectors and less out of boxes seems to be the consensous.

Ive got 55k miles on mine and it has been a great truck. One lift pump and some track bar issues. But all around I am happy.

Also look to see if it has four wheel disc brakes. i think they make a huge differecnce in stopping power.

Ted

 

[RJMurphy]

Yeah, its a 2001

 

[Mark_Kendrick]

The ETC(autos and 5spds) get better mileage and respond better to BOMBing. . For towing the ETH is the truck to have.



For racing... get the auto.



Me, I'm putting an auto in my ETH



Later,

Mark

 

[Hohn]

Originally posted by Ted Constantine

... The only difference, "functionally" from the standard output is the higher compression ratio makes the EGTs a little higher... .



Also look to see if it has four wheel disc brakes. i think they make a huge differecnce in stopping power.



Ted

Ted, I agree and I disagree. I agree on the brakes totally-- it takes a lot to get at least 6800 pounds to stop! Imagine towing with no trailer brakes! Yikes!



But I disagree with you on compression ratio causing higher EGT. I agree that the HO motors tend to run a little higher EGT, but this is because they have a different VP44 that fuels more. This fueling is the cause of higher EGT. If anything, a higher compression ratio means LOWER EGT, because 1)fuel burns faster from higher temp at TDC, and 2) the greater expansion ratio gives the air more room to expand (and thus, cool) before being exhausted.



If they were running the exact same VP44, the HO motor with the higher compression would actually have lower EGT.



Hohn

 

[Okie-Go]

I have an 01 ho 6spd 2wd with 63,000 miles and some change. I had the rear pinion seal replaced. I also put in a new clutch but that was prolly the 275's and the e-z edge had a little to do with that. My truck is super and I can't think of anything bad to say about it. I have gotten 23. 3 mpg figured by hand several times on the highway.

 

[Ted Constantine]

Hohn this has been a point of contention for some time. I do not have a clear answer for the EGT issue but here is my thinking. With a higher compression ratio the air is compressed more so the combustion chamber temperature is higher. The issue i have with the theory you just stated is that the ETH actually has smaller injectors than the ETC from the factory. How could that much more fuel be poured on under stock conditions through a smaller injector? Is this completely flawed?

Ted

 

[RustyJC]

Originally posted by Ted Constantine

How could that much more fuel be poured on under stock conditions through a smaller injector?

Certainly possible if the fuel is at higher pressure and/or if the injection duration is longer. The ETH uses a different VP-44 than the ETC, right?



Rusty