[Anaxagoras1986]

I took a trip out to Connecticut (1.5hrs of driving). It was almost all highway miles and my SVT ran very well out there. When I pulled up to a friend's house and let it idle as I waited for him to come out, however, the car started spark-knocking and slmost stalled! I gave it tiny bit of throttle and it woke right up but felt a little weak and was still spark-knocking a tiny bit when it came back ot idle. It definitely wasn't a rattle of a bracket either. Once I started driving on the highway it cleared right up again but right after I left the house it felt REALLY weak.

My car is bone stock and has a Stock Ford Tune. I always run 93 octane too. I checked to see if my millage reflected any sort of issues and I averaged about 32MPG with two people and 2-300lbs of crap in the back hatch area on stop+go Rt6/44/etc so I guess she was running perfectly on the highway... Was it heat saturation that caused this? It was a cool night with no rain and temps were in the same area as usual. What gives?

 

[DomestikZx3]

check your coil pack and wires maybe plugs too while your at it.

Could have a split in the wires somewhere. Possibly let it run and take a look at the wires to see any arching between any of them.

 

[amistad51]

I had the same problem. I took it to the dealer and they found a vacumm leak in a hose comming behind the throtle. I wish I should have known that I could have saved $300 in labor if I had replaced it myself. They replace the hose it cost something like $40.00

 

[FocusDog]

Why 93 octane in a bone stock vehicle?

 

[penguin]

What is "spark-knocking?"

 

[WD40]

Why 93 octane in a bone stock vehicle?

SVTF: Requires 91 octane minimum.

What is "spark-knocking?"

Another term for pre-ignition, detonation, pinging, or knocking.

 

[Anaxagoras1986]

I'm on my third coil pack in 20k miles. First one blew and I put a used on in it that promptly died. I put a new one in and so far so good. I put fresh wires/plus on it very recently too. I also inspected all of the wires and everything looks good right now...


I think the vacume line thing might be it! Maybe it was running lean? Also, I noticed the car tried to idle at around 2500RPM yesterday on a cold start. I turned it off let it sit for a few seconds and tried starting it again and it idled down to about 1k. High Idling is typical for vaccume leaks. The car is also SURGING- when I accelerate it takes off like a bat out of hell once I hit 2800RPM.

 

[amistad51]

In my case it tryed to idle very low. When the engine was cold it wen't to fast idle as it should be and it was smooth

 

[Anaxagoras1986]

Where was this vaccume line that you had problems with? It's next the the TB?


Thanks for the input guys!

 

[Blurvfocus]

It's "vacuum". I don't know of another word with double u's like that. That's how I remember how to spell it. Not trying to be a smarty pants now, but for us here on these particular boards, it's a frequently used word that usually gets butchered.

 

[amistad51]

Underneath the throtle valve. It is hard to see and the assembly contains several lines.

 

[FocusDog]

SVTF: Requires 91 octane minimum.

I did not know that -- sorry!

 

[Anaxagoras1986]

Underneath the throtle valve. It is hard to see and the assembly contains several lines.

OK thanks for the info! I'll check those lines out!

 

[Anaxagoras1986]

Starting to think that the TPS might be a little screwy too- The car sometimes doesn't respond to throttle in the area where I am always at (10-35%). As soon as I let off a little (5% area) or hit it a little harder (40+%) it responds. Maybe it is the vacuum lines but it seems a little odd for it to be like this at any RPM... It only does this once and a while too.


Any thoughts?