tow rig WAY down on power after engine rebuild

[Caleb]

When I replaced a cat a few months ago I looked all over for Hickey's fabled $50 vatozone cat. I doesn't exist. Cheapest thing I could find was through Beach. Right around a hundred bucks, I think.

you can get a universal from Summit Racing for between $50-$100 (depending on exact measurements and size) page

 

[RockMonkey]

Good to know. Summit ships FAST too! FYI the Checker, Autozone, etc, cats were all ridiculously expensive. Like 300 bucks. Even the other Master Muffler wanted 200.

 

[Hickey]

Good to know. Summit ships FAST too! FYI the Checker, Autozone, etc, cats were all ridiculously expensive. Like 300 bucks. Even the other Master Muffler wanted 200.

You got to ask the right Vato

 

[Maverick]

You got to ask the right Vato

HAHAHAHa

well it's all a moot point. Beach checked them this morning, measured out ok at 3.5. Back to the drawing board. What the hell else?????

Oh, doesn't change a thing: I Lean is next after Milner

 

[chevtech]

HAHAHAHa

well it's all a moot point. Beach checked them this morning, measured out ok at 3.5. Back to the drawing board. What the hell else?????

Oh, doesn't change a thing: I Lean is next after Milner

You did replace your fuel filter when replacing the pump right????

 

[Maverick]

You did replace your fuel filter when replacing the pump right????

yep

 

[Greg]

I'd do a compression test, & possibly a leakdown test if you have the access to the tools.

 

[Maverick]

I'd do a compression test, & possibly a leakdown test if you have the access to the tools.

yep, planned for tomorrow morning.

Seemed to have a bit more git this morning when it was cool, lost it as it warmed up. Didn't time it (0-60) so I can't be certain.

Edit on 7-6:
0-60 this morning was 13.1 sec, slight uphill.
0-60 on flat freeway, engine warm: 14.6 sec.

 

[Maverick]

Have you done a compression check and all that good stuff?

Ok, today we did comp test and vacuum test, also drove with the scanner hooked up.

Comp: 145 per hole
Vacuum: 15 at idle, up to 17 at WOT

Scanner read 26 deg advance at idle and at high rpm, no load. Under load at higher rpm (WOT) it read 16 deg advance ...and this seems really strange. We're trying to get another vortec 454 to run the scanner on.

This is like the first clue, the first thing that hasn't checked out to be in spec.

Brett

 

[drylok]

Ok, today we did comp test and vacuum test, also drove with the scanner hooked up.

Scanner read 26 deg advance at idle and at high rpm, no load. Under load at higher rpm (WOT) it read 16 deg advance ...and this seems really strange. We're trying to get another vortec 454 to run the scanner on.

Brett

Your timing numbers look suspicious. I am not sure about computer controlled engines, but you should probably be around 8-10 degrees at idle and 25-30 degrees at around 3000 rpm.

 

[harkinoff]

Your timing numbers look suspicious. I am not sure about computer controlled engines, but you should probably be around 8-10 degrees at idle and 25-30 degrees at around 3000 rpm.

It does sound like a timing issue.... they usually ping through the exhaust when timing is too hot... is it a steady ping and only under a load "excellerating"?

 

[Maverick]

It does sound like a timing issue.... they usually ping through the exhaust when timing is too hot... is it a steady ping and only under a load "excellerating"?

ECM controls knock...and we haven't heard any.

 

[mbryson]

Do the 'Vortech' engines still have ESC? That could be a good problem area to look into.

 

[bobdog]

Vacuum: 15 at idle, up to 17 at WOT
Brett

This does not seem right is your intake restricted?

 

[Caleb]

Your timing numbers look suspicious. I am not sure about computer controlled engines, but you should probably be around 8-10 degrees at idle and 25-30 degrees at around 3000 rpm.

I dont know about Vortecs but this is about right for TBIs...