[biglogonafrog]

I'm about to aquire an 99 4.3 high output v6 engine


Can someone tell me the difrence in the regular and high output versions?

Also Its an automatic what can I expect for mpg?

Also there is 55,000 miles on it is there any big maintanence that needs to be done soon?,thanks to all replies

 

[bluedragonx]

The engines is the same displacement. I think the HO is higher compresion, but I'm not sure...

 

[biglogonafrog]

The engines is the same displacement. I think the HO is higher compresion, but I'm not sure...

Ok thanks

Does anyone else know anything else???

 

[guhman2002]

Highoutput is a W code in the vin.
Regular is an X code in the vin.

The difference is a slightly more aggresive cam, 10HP I believe.

 

[biglogonafrog]

Highoutput is a W code in the vin.
Regular is an X code in the vin.

The difference is a slightly more aggresive cam, 10HP I believe.

Thanks heres the vin # can you tell me which one it is...it has both the w and the x,thanks

1gccs14w4x8205585

 

[brokeitagain]

8th digit is engine id, 10 is year

 

[guhman2002]

therefore you have the W engine which IS the high-output engine. look for anywhere between 13-25 miles per gallon depending on tune-up, driving style, location.

 

[biglogonafrog]

therefore you have the W engine which IS the high-output engine. look for anywhere between 13-25 miles per gallon depending on tune-up, driving style, location.

That kind of scares me,i'm hoping to get atleast 20mpg,the only engine work that has been done is a cold air intake kit

So does that highout put engine decrease the gas mileage that much?

Also is the reliability going to be any diffrent,than an non highout put 4.3,thanks

 

[guhman2002]

no, they are basically the same, my cousin has an X code engine, and I have a W, when mine was stock I couldnt really notice a difference between the two.. I gave that wide range of gas mileage because it depends..

If you keep it well maintained and drive conservatively you will probably get 20+ MPG

 

[devilman13xx]

i get about 18-19 with my 98 "w" although mine is a 4 door blazer so its a lot heavier

 

[biglogonafrog]

Okay thankyou all for replying

 

[devilman13xx]

one thing you more than likely run into is a bogging stumble at low temps/rpms , it starting become a rather common problem but its mainyl just annoying. seems like everyone is working together to figure out what causes it and so far no clear answer lol

 

[RKs95BlackSS]

w/ my 95 w i get anywhere from 15-19 but its bored .30 n' has an aggressive cam

 

[biglogonafrog]

one thing you more than likely run into is a bogging stumble at low temps/rpms , it starting become a rather common problem but its mainyl just annoying. seems like everyone is working together to figure out what causes it and so far no clear answer lol

Well hopefully that shouldn't bother me too much. As long as its fine when it warms up

 

[1fast4by]

one thing you more than likely run into is a bogging stumble at low temps/rpms , it starting become a rather common problem but its mainyl just annoying. seems like everyone is working together to figure out what causes it and so far no clear answer lol

Ive never had that happen to any of my engines or anyone else i know sporting a 4.3

 

[devilman13xx]

mine does it and ive seen at least like 8 threads with people saying the same symptoms.

its still mainly an isloated occurance but like i said im seeing more and more threads with these same symptoms.

mine goes away as soon as the tstat opens up som im think the coolant sensor

 

[mat1583]

Ive never had that happen to any of my engines or anyone else i know sporting a 4.3

Mine is doing that, but it's also not very stock

 

[1fast4by]

Mine is doing that, but it's also not very stock

mine isnt either