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Old 04-08-2008, 07:49 PM   #11
WD40
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I don't recall fuel pump problems on the SVT though.
Well, extremely rare instances anyway.

If what people are getting at is the standard models having fuel pump recalls, I highly doubt this is the problem with your car.
Though, the symptoms are familiar.

Check the coil wiring first, as that is a known problem.
Also, check the wiring going to the MAF.
Those are also really tight, and could pull out/fray/break.

Have you looked to see if any error codes are stored???
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Old 04-08-2008, 09:57 PM   #12
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what kind of plugs did you use?
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Old 04-08-2008, 10:11 PM   #13
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Alex I'll take VCT issue for $1,000 please.

The rpm seems about right, recent oil change, pretty consistent in your specified range and heat does affect oils viscosity. From what I understand of Fords VCT system it is purely passive and oil pressure dependent (but I'm not sure on that).
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Old 04-08-2008, 10:17 PM   #14
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nope, doubt vct at all. If theres a vct issue it wouldnt cause a miss at a certain rpm, it;ll throw alot of things out of whack at once and not just for a split second.
The svt is known for not liking certain brands/types of plugs tho. (mine absolutely hates ngk and bosch plugs and will not run right until i go back to autolites or motorcraft)
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Old 04-08-2008, 11:18 PM   #15
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Is there any way to tell which cylinder it could be? (if it is even isolated to one at all)

I am not claiming to know much about this problem but someone please educate me if I am wrong. He says it happens under hard cornering when g-forces are probably at their highest. Maybe it is a combination of the amount of fuel in the tank, weak fuel pump, and maybe the location of the cylinder. Say he takes a corner very fast. The apex is probably when the forces on the car are probably the most as he is acceleration hard outta the turn. There is a weak fuel pump which as fuel moves to one side of the tank, cannot feed the motor well. These two things could cause the miss when the car needs the fuel most.

As for cylinder location maybe the pump cannot supply the rail properly under a hard corner causing the cylinder farthest from the pump to run lean for a very short period of time. Keep in mind this last point is entirely speculation so please educate me if I am wrong.
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Old 04-08-2008, 11:55 PM   #16
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I was going to suggest a fuel pump or fuel system issue as well, maybe something clogged along the way preventing fuel from flowing more quickly for higher rpms. Maybe the plugs are faulty and it's just invisible to you...
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Old 04-09-2008, 12:19 AM   #17
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Pull the fuel filter and change it out anyway.If you don't find ignition issues. it really sounds like an ignition, plug wire issue; as that is what you just replaced. I always look to work I just did for the problem. Put the old wires back on and see if the problem goes away. Its VERY rare, but we had a bad wire set once, right out of the box.

Timing belt would not go away, and fuel would not want to clean up either. I really do think its ignition.
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Old 04-09-2008, 10:22 AM   #18
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Thanks for all the tips!

I've made a list and will be working from simple to complicated.

I'll dig into it over the next few days as time permits.

For now, the car is parked and I am driving the grocery getter, but I will give an update as things sort themselves out!

Thanks again!
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Old 04-10-2008, 10:56 AM   #19
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Gremlins...It has to be gremlins, and not the AMC variety either.

The little bastages that get into things and cause general mayhem with no obvious cause.

What I have done thus far to diagnose:

1. Replaced new wires with the old wires (to determine if there is a fault in the wires)

2. Inspected the plugs again and regapped (all appear to be fine)

3. Rechecked connections at the coil (including sensors and plug wires - all appear to be fine)

Ran the car for a spirited drive into the 5000+ RPM range. 1st gear, no issue. 2nd gear, no issue. 3rd Gear - WHAMMO same problem. Dropped 300 revs and the car "lurched" back to speed.

Next steps:

1. Refitted the new wires,

2. Double checked coil connections

3. Replaced fuel filter

4. Inspected and cleaned the MAF. Used a hair dryer to affect temperature change and I gently tapped it with a screwdriver. No adverse results. So, I think the MAF is working properly.

Ran the car for a spirited drive and had the same result, but the hiccup was not as pronounced.

At this point, I am inclined to replace the coil and the sensor wiring harness. I will do that this weekend and see if there is any improvement.

I will also do a fuel pressure test, but I am less inclined to believe that there is an issue with the fuel system, but I am not ruling it out.

Anyone know a good priest that is available in the evenings and weekends to perform automotive exorcisms?
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Old 04-10-2008, 11:49 AM   #20
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hahaha, every1 pray for his car. I have a hard time thinking it might be your coil itself. Im thinking it mite be the harnesses connecting to it. I had a similar problem. Actually very similar more i try to recall it. It would rev up and then itd catch itself and itd be fine but then itd stumble. I know mine is a reg zetec so i dont know if itll be the same problem.
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