Help on GT40P/Cobra intake install

darthcual

Member

Mar 31, 2005

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Arlington, TX

Sep 19, 2011

#1

• Sep 19, 2011

• #1

I've finally got everything back together but the engine is not wanting to idle. Running rich and popping. I tried setting TDC at number 1 and adjusting the dizzy twice. No codes and the motor has new 02 sensors/ACT/EGT. Seems like the backfire is only coming from the right side. Its a 1993 GT if that helps.

 

jsw81

5 Year Member

Mar 19, 2007

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IA

Sep 19, 2011

#2

• Sep 19, 2011

• #2

try adjusting the throttle position sensor if you haven't already

 

darthcual

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Mar 31, 2005

985

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Arlington, TX

Sep 19, 2011

#3

• Sep 19, 2011

• #3

Word i will gibe that a shot

 

Kdubslugga

Active Member

Jun 7, 2003

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Akron, OH

Sep 20, 2011

#4

• Sep 20, 2011

• #4

Everything was ok before your intake installation? If so, and you removed the distrubutor,. check you timing again. Then check for vac leaks.

 

LarsD

Founding Member

Jul 2, 2002

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Sep 20, 2011

#5

• Sep 20, 2011

• #5

Make sure you don't have any vacuum leaks, I was working on mine Sunday, knocked a vacuum line off and didn't realize it. Was running all stupid until I found it. Also make sure that #1 is actually firing off of the post that is marked #1 on the dizzy cap. This helps sync the injector firing with the ignition.

 

darthcual

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Mar 31, 2005

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Arlington, TX

Sep 21, 2011

#6

• Sep 21, 2011

• #6

Okay the vacuum is good. Fuel Pressure is good. Maf is good as tested by dvm aswell as the baro sensor. We are going to try swaping injectors next as the po put python 24lbers and we think its getting to much fuel.

 

LarsD

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Jul 2, 2002

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Sep 21, 2011

#7

• Sep 21, 2011

• #7

Did you check your push rod length when you assembled it? If they are too long you could have valves hanging open.

 

darthcual

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Mar 31, 2005

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Arlington, TX

Sep 21, 2011

#8

• Sep 21, 2011

• #8

No. But come to think of it one of my knuckle head buddies pulled a pushrod out and said whats this. I wonder if when he threw it back in it didnt seat in the lifter? Idk if thats even possible?

 

darthcual

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Mar 31, 2005

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Arlington, TX

Sep 21, 2011

#9

• Sep 21, 2011

• #9

Also the backfiring is intermittent and goes away when load is on the engine

 

LarsD

Founding Member

Jul 2, 2002

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Sep 21, 2011

#10

• Sep 21, 2011

• #10

darthcual said:

Also the backfiring is intermittent and goes away when load is on the engine

Click to expand...

Could be a tuning issue. What cam are you running?

 

darthcual

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Mar 31, 2005

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Arlington, TX

Sep 22, 2011

#11

• Sep 22, 2011

• #11

As far as i know its stock. I wanted to maintain drivability. No telling what the P/O has done but i know the bottom end was rebuilt in 09 with a 30 over.