Strange stumble at high RPM

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Old Feb 24, 2008 | 04:39 PM
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Default Strange stumble at high RPM

Searched already so no luck there.

I've noticed that once I've cleared 5k-5.5k RPM in any gear at full throttle, my car doesn't want to accelerate any more. It doesn't happen all the time, and not in every gear. I notice it most at WOT in 3rd, once it hits about 5.5k RPM it refuses to accelerate and sounds like it's backfiring. Again, it has happened in first, second and third gear but it doesn't do it all of the time, and there doesn't seem to be a pattern as to when it happens (i.e. randomly).

I'm guessing it's a timing issue, but out of all the EF's I've owned this is the first time I've ever had it happen.

VITALS:
-stock D15B2 engine and tranny, SRI and genericanister exhaust
-just passed smog with flying colors
-seems to be getting worse...


Modified by bigrob119 at 5:08 PM 2/28/2008
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Old Feb 25, 2008 | 04:59 PM
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Default Re: Strange stumble at high RPM (bigrob119)

No one? C'mon, help an old man out.
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Old Feb 25, 2008 | 06:25 PM
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Default Re: Strange stumble at high RPM (bigrob119)

I take it that your car is warmed up? I know the car doesnt want to engage VTEC (around 5k rpm) when the temp is cold.. sorry if this doent help..
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Old Feb 25, 2008 | 08:34 PM
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Default Re: Strange stumble at high RPM (hatcht9x)

Timing is off a tooth
Also check ignition timing
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Old Feb 27, 2008 | 02:09 PM
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Default Re: Strange stumble at high RPM (alscrx)

As I expected. Thanks.
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Old Feb 27, 2008 | 02:15 PM
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Default Re: Strange stumble at high RPM (bigrob119)

sometimes an ignitor going out can have symptoms like these
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Old Feb 28, 2008 | 02:39 PM
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Default Re: Strange stumble at high RPM (Crx Jimmy)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Crx Jimmy &raquo;</TD></TR><TR><TD CLASS="quote">sometimes an ignitor going out can have symptoms like these</TD></TR></TABLE>

If that's the case (or any other dizzy related issues) I'll con, er, convince my wife it's time for the MPFI swap.
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Old Feb 28, 2008 | 03:11 PM
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Default Re: Strange stumble at high RPM (bigrob119)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hatcht9x &raquo;</TD></TR><TR><TD CLASS="quote">...I know the car doesnt want to engage VTEC ...</TD></TR></TABLE>what vtec?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bigrob119 &raquo;</TD></TR><TR><TD CLASS="quote">

If that's the case (or any other dizzy related issues) I'll con, er, convince my wife it's time for the MPFI swap. </TD></TR></TABLE>
didn't you say it's a d15b7?!?!? the b7 IS MPFI unless you're talking about a d15b2.
The B2 has some nasty injection problems, but they're not like you describe it.
a misaligned cam-belt would be the the best bet, but also kep in mind that it can also be the spark plug wires ot the dizzy cap. Those two problems are easily diagnose with a water spray in the dark

Good Luck
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Old Feb 28, 2008 | 04:08 PM
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Default Re: Strange stumble at high RPM (1net)

I meant B2, never went back to edit it.
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