I know the subject is old. Surging, and the theory is heat range on the stock spark plugs, I have read a thread somwere the with better plugs the surging will be very reduced or non existent at the best case. Can somone tell me if this sounds good, got my build cert.[:p] [:p]

yeah, that would be interesting. I know denso says the regular zetec takes their ITV16 plugs and the SVT takes ITV24's, but I think ford used the same heat range plugs in both engines. someone get some new plugs and find out!

yeah, someone be the guinea pig.

I'll be the guinea pig if someone buys the plugs! [:)~]

Ohhh Ohh I will be your guinie pig. I bought the Denso ITV16's and it worked. The only time it surges is right when I get done racing around that a bat out of h%^& but thats normal with any car. It stops after about 2 or 3 mins.

Also when i bought them they only had ITV16's so I might have to spend another $50 on plugs dangit!

Um,
Just a few days ago, DiLSVT came to the same conclusion. Clicky (http://www.focusfanatics.com/forum/showthread.php?s=&threadid=25041)
Interesting theory. I think I'll wait till someone else spends the money though. [:D]

comporangesvt is the man or women. I really think that the motor craft plugs can't handle the svt engine heat. it sounds stupid, but the engine produces alot of freaking heat. the other plugs may be tested at the same heat range, but they handle it better.

PimpSyndicate? WTF?

Hahaaaa.... good one.

SVT takes a colder plug than regular Zetec due to higher compression/higher octane.

svt medic you maybe right i just had a valve failure in my 04 and they dealer also said that 3 of the 4 plugs had the eletrodes missing or broke. I'm not sure as to what all went wrong its only got 3,011 on it. Also it having gotten may car back, a new motor is being put in. When this happened i was at about 5k in 3rd, the CEL came on, but wasn't alot of noise. It sounded like t wasn't running on all 4, which is kinda obvious. there was probaly something else that caused the problem it had.

If you look at the old edition of Focus Fanatics (New one comes out the 28th, I guess), the article about the SCT tunning says that after tunning it eliminated the surge by adjusting the spark timing or something like that (have mag, will have to look later). So I don't think new plugs will help much if any cause I guess it is in the programing. I have the Denso Irridium plugs and the surging is still there.

Just looked at the mag (page 41) there exact words are "Changes to part-throttle spark eliminated nearly all the cars previous low-rpm surge/stumble issues." I don't know what that means but I think it has something to do with a spark. Really I don't know what it means but I figure some one on here can point it out. Thanks.

From what I have read in Focus Fanatics and in SCC is that the the MAF is to close the the engine and air is flowing backwards thought the meeter and the engind thinks its got twice the air and dumps more feul into the engine. The only way to fix this problem is with a tune.

Originally posted by McSVT
From what I have read in Focus Fanatics and in SCC is that the the MAF is to close the the engine and air is flowing backwards thought the meeter and the engind thinks its got twice the air and dumps more feul into the engine. The only way to fix this problem is with a tune.

yeah, that's what i heard, too

besides a tune, i noticed that when i changed to the AEM cold air intake, not the short ram, it fixed the problem of surging and also fixed the problem of the bat light coming on when i go into nuetral from a highway drive!

Not to argue but Focus Fanatics had one issue out and in that issue it says ""Changes to part-throttle spark eliminated nearly all the cars previous low-rpm surge/stumble issues.". If by doing that it eliminated almost all the surgeing then why would you think the MAF sensor has anything to do with it? In my case I have pin pointed a fact and dyno tested solution to the surging, can you tell me/us the page and issue you are refering to? Plain and simpe, it is in the ECU/PCM (what ever you want to call it). If that wasn't the case then why was the YRFO update supposed to help with the surging issue?

Check out the aritcal "Tuning in a Flash" (page 38) in the Spring 04 issue of FF. They have a right up of a Superchips Custom Tuning base ling retune for the SVT. It's a good read.

That is where I got the previous information. I just skimmed over the story but if you look at page 41 in the yellow section that is where I got the quote from page one of this post. For what it is worth I got a K&N cone filter and denso irridium plugs in my svt and it helped with the surging but it is still pretty noticable before the car is warmed up.