wickedly stupid question

MysticKeith50 · Feb 7, 2006

I have tf tw heads and got the autolite 3924 plugs. Are they pregapped, or do i still gap them to .054?

stang302v8 · Feb 7, 2006

sorry, i dont have the answer to that question but i was wandering, do u have to use those specific plugs? i bought a pair but my motor isnt ready yet, so i havent ran it with the tw heads on. if u have ran ur car with them already, what do u think of them( performance wise)?

MysticKeith50 · Feb 7, 2006

yes i was told by tf to use them.....I am just having a little idle problem at cold.....I am going to check tps, iac, and just thought to ask this about the plugs.

95Vert · Feb 7, 2006

It doesn't hurt to check Keith.

MysticKeith50 · Feb 7, 2006

i checked...they were all like .040 and now i am wondering if they should have been .054?

Iggyshane · Feb 7, 2006

i allways think its better to check rather then doing something twice. plus it only takes 30 seconds to check all the plugs.

95Vert · Feb 7, 2006

Since you're running bigger heads and all, I can't say for sure. But try gapping them at .054 since you're having some idle issues.

Grn92LX · Feb 7, 2006

They WILL need to be gapped. .050" is fine for a n/a combo. The 3924's are the most common used plug for an aluminum head and very easy to get so thats why they're the most recommended.

urban96 · Feb 7, 2006

Grn92LX said:
They WILL need to be gapped. .050" is fine for a n/a combo. The 3924's are the most common used plug for an aluminum head and very easy to get so thats why they're the most recommended.

yep, +1

MysticKeith50 · Feb 7, 2006

hmmmm...lets say hypothetically all the plugs were at .038 to .039 could that be my problem with my cold start idle?

Grn92LX · Feb 7, 2006

MysticKeith50 said:
hmmmm...lets say hypothetically all the plugs were at .038 to .039 could that be my problem with my cold start idle?

No.

Let me guess.. You start it up cold and it wants to stall and die. You have to keep your foot in it for the first few seconds to keep it running, right? Its simple to fix with a tuning device. I had that problem once. Its a cold start lean issue.

94gts · Feb 7, 2006

why are the gap numbers so high?

my gt40 iron headed/nitrous set up i had stock replacement autolites at .035. I know that with a power adder the gap is lower but out of the box i think they are .044

VibrantRedGT · Feb 7, 2006

Mine are gapped at .045. With iron heads .054 is recommended by Ford but with Autolite 24's.

Your idle hunt is not from the gap. Too much fuel usually causes cold start idle issues. The ECC dumps more fuel at cold start up's. I had the same issue with the Pro-M bullet meter and 24# injectors. Tuning is the best cure. However play with fuel and timing settings until its tolerable.

HISSIN50 · Feb 7, 2006

Joe, seems to me that 25's are the stock plug for GT's. 24's would be stock for Cobras.

legalize420 · Feb 7, 2006

HISSIN50 said:
Joe, seems to me that 25's are the stock plug for GT's. 24's would be stock for Cobras.

764 for the cobra

HISSIN50 · Feb 8, 2006

legalize420 said:
764 for the cobra

Hmmm, my bad. Since GT's use ASF-42's, which equate to a 25, I assumed a AWSF-32 would equate to a 24.

If I am wrong, I apologize for the misinformation.

Grn92LX · Feb 8, 2006

VibrantRedGT said:
Your idle hunt is not from the gap. Too much fuel usually causes cold start idle issues. The ECC dumps more fuel at cold start up's. I had the same issue with the Pro-M bullet meter and 24# injectors. Tuning is the best cure. However play with fuel and timing settings until its tolerable.

Actually, from what I have experienced, once you get into bigger injector and maf combo's the eec doesn't add enough fuel on cold starts. This is why adding cold compensation fuel through our PMS's fixed our cold start issues.

Hot starts are where the eec dumps too much fuel. And pulling out cranking fuel in our PMS's fix that too

MysticKeith50 · Feb 8, 2006

damn i thought my new sct chip i got would take care of this!!!

Green 94 5.0 · Feb 8, 2006

MysticKeith50 said:
damn i thought my new sct chip i got would take care of this!!!

it will, you just need to get it tuned properly.

VibrantRedGT · Feb 8, 2006

Grn92LX said:
Actually, from what I have experienced, once you get into bigger injector and maf combo's the eec doesn't add enough fuel on cold starts. This is why adding cold compensation fuel through our PMS's fixed our cold start issues.

Hot starts are where the eec dumps too much fuel. And pulling out cranking fuel in our PMS's fix that too

My car seems to be the opposite then. In the morning it surges. I take fuel out with the PMS and the hunt will stop.

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