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Old 05-22-2014, 12:29 AM   #1
Klenzer
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SVT stopped revving past 6000rpm (and my first post!)

Hey guys, just joined the ranks of SVT owners - so far LOVING this car. Tons of fun. I bought it mostly for rallycross, but have been having a blast just whipping it around town. So far it's been nearly perfect, but have had one interesting issue... hopefully I could get some feedback or its a known issue.

I took it to a rallycross race this past weekend (placed 2nd in 2wd) and it ran fine all day, except in the later afternoon, I realized that it wasn't revving over 6000rpm, far below the limiter, and was taking much longer to rev up to there. I took it off the track and on to the street, same issue all the way up the gears. And the put it in neutral and... vroooom! right up to the limiter, no problem, perfect. Parked it, changed the tires back to street (was my end of day anyway), fired it up and... perfect in all gears again.

Drove it 2 hours home, whipping it through gears like a madman from time to time (hey it's FUN!) and not a single hiccup since.

I kind of hate problems that go away on their own, since you don't know when they'll come back again (like in the middle of a race), so if anyone has any suggestions on what it could be so I can figure it out faster if it happens again, or prevent it from doing so, I'd appreciate any thoughts.

Thanks!
(oh and I would post pics but photobucket seems to be down right now)


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Old 05-22-2014, 12:49 AM   #2
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Don't know for sure but maybe your IMRC motor is slowly going out,and you might want to check out your DSI cable..There is a lot of info in the search section
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Old 05-22-2014, 10:04 AM   #3
KendogSVT
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If the IMRC was not working, the car would still rev to 7200. The IMRC only operates the dual stage intake. My IMRC went and was stuck in the 2nd stage all the time. It revved like normal. I would say its something with the ECU that would stop it going higher via the spark plugs or injectors.
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Old 05-22-2014, 10:12 AM   #4
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Things that would cause this , the first thing that comes to mind is fuel psi , CAT stopping up , dirty MAF etc
Nothing ECU related would cause this it would be something like fuel pump , fuel filter , CAT going bad which would be very rare for the SVT CAT

Tom
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Old 05-22-2014, 11:14 AM   #5
qweesy
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check and see if crank or cam sensor is damaged or gouged..... more likely the crank sensor will be
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Old 05-22-2014, 05:30 PM   #6
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Hey Klenzer,

This is Norm from the Rally-x (in the red SVT)

fuel filter is good to check.

Since its a new to you car. other common problem (maybe unreleated to the current)
thermostat housing leak, coil pack cracks and pigtail fraying, valve cover gasket (check for oil in spark plug wells), IMRC and DSI lever.
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Old 05-22-2014, 05:36 PM   #7
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My guess is bad fuel. Knock sensors probably retarded the timing to protect the engine.
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Old 05-22-2014, 11:32 PM   #8
Klenzer
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Quote:
Originally Posted by thenorm View Post
Hey Klenzer,

This is Norm from the Rally-x (in the red SVT)

fuel filter is good to check.

Since its a new to you car. other common problem (maybe unreleated to the current)
thermostat housing leak, coil pack cracks and pigtail fraying, valve cover gasket (check for oil in spark plug wells), IMRC and DSI lever.
Hey man! Was hoping to run into you here! I checked the coil and pigtail for cracks once I got home like you suggested, but they look decent.

I'll take a quick run through everything else suggested and see if I can red flag anything, since it sounds like the most votes are for fuel, I'll start there.

Sounds like the IMRC and DSI lever are good to check anywa. Found some great tutorials on this site, so should be pretty easy.

And then... skid plate so I don't leave any more heat shield on the middle of the track! :)
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Old 05-28-2014, 08:41 AM   #9
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i had the same exact problem tom may remember this but my car wouldnt go past 6k and it was the crank position sensor
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