89 MUSTANG LX

[John Bzstang]

Ok guys just picked up a almost mint 0 rust 1989 mustang lx has a 308 with a mild cam that the guy just put in it. That being said when you start it she revs high and after about 30-40 seconds the headers start glowing hot he said he thinks something is roached in the motor because it was making a noise when he first put it in and started it. Now is doesn't make a noise but it revs high and headers get hot fast any advice would be great thanks guys.

 

[Adieu]

Moved to the correct forum.

 

[HemiRick]

lean fuel mixture and/or retarded timing will cause headers to glow..

 

[John Bzstang]

what would cause fuel to be lean?

 

[nickyb]

what would cause fuel to be lean?

Not enough fuel/ too much air. Do you own a timming light? Check timming.

 

[Mustang5L5]

Could be a vaccum leak as well. A big one

 

[General karthief]

What supporting modifications?
How old is the fuel pump?
Throttle body/maf/injector size?
Intake type?
Without info we are stabbing in the dark.

 

[John Bzstang]

has 24lb injectors ,systemax top end, newer fuel pump

 

[John Bzstang]

What supporting modifications?
How old is the fuel pump?
Throttle body/maf/injector size?
Intake type?
Without info we are stabbing in the dark.

has 24lb injectors ,systemax top end, newer fuel pump

 

[2000xp8]

What meter?

 

[John Bzstang]

What meter?

What do you mean by meter?

 

[2000xp8]

Your mass air meter.
Located passenger side by air box or filter.
It must match the injectors.

 

[John Bzstang]

Your mass air meter.
Located passenger side by air box or filter.
It must match the injectors.

maf?

 

[Mustang5L5]

Mass Air Flow meter

 

[John Bzstang]

calibrated for 24lb injectors believe 70 or 75mm diameter

 

[John Bzstang]

calibrated for 24lb injectors believe 70 or 75mm diameter

Mass Air Flow meter

Are you thinking its something to do with that? He had a 331 in the car before this with the same set up and didn't have this issue

 

[General karthief]

Timing and/or a large vacuum leak.

 

[John Bzstang]

Thanks for your help on why my headers are glowing red and car is idling high also when I rev it up to like 3000-3500 when I let off the gas it stays at 3000-3500 where do you think I should start thanks for your help

 

[General karthief]

See post #17
Or are you asking about a procedure on how to check those things?

Help me create the "Surging Idle Checklist"

Updated 26-Oct-2019 to clarify creeping idle RPM increase as the car is being driven. Many of you are familiar with the "Cranks OK, but No Start Checklist for Fuel Injected Mustangs" checklist and the No Crank Checklist. They are very effective in finding and eliminating the problems by use of...

forums.stangnet.com

Fox - Setting timing for new motor

I know, it's a simple task. But damn, my anxiety gets me all the time. Reassure me here......Please Setting the timing on a new motor and build. First time builder. Looks easier on TV. 1. Find true top dead center. While turning the crank slowly, I used my finger to confirm compression stroke...

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[John Bzstang]

I see A guy Timbo80 back in 2016 had the same exact problem anyone know what he figured out?