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Author Topic: Hesitation and idle stumble  (Read 4100 times)

CapriXR2

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Hesitation and idle stumble
« on: October 02, 2013, 07:46:59 PM »
Hey, I have a 91 XR2, 102k. I have a hesitation that feels like fuel cut. My exhaust snaps and pops it sounds like anti lag. I think it is my VAF, I cleaned it, it was better for a day. It will hesitate at 55 MPH if you hold it steady for a mile or so, usually can push through it. It also hesitates at 2800 RPM in second gear almost every time. The Longest hesitation was 3 seconds or so. It also idles at 900rpm if I try to turn it down it bogs a second then bounces back up to 900. At most stop lights the idle will drop to 500 shutter a second and bounce back. All gauges are good and no dash lights are on.

What are your thoughts on a fix?

Thanks
Brian
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tonlaw71

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    • 1992 XR2 and a 2013 Nissan Juke
Re: Hesitation and idle stumble
« Reply #1 on: October 02, 2013, 09:36:01 PM »
When's the last time you tuned it up? Plugs, wires, dizzy cap, roto...Also, might want to check your timing. Could be a clogged fuel filter, too.
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///Tony aka Bubba Gumpshrimp\\\

///'92 Plasti-Dipped XR2\\\

Rocketman

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    • 91 BPT AWD Capri & 1991 XR2
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Re: Hesitation and idle stumble
« Reply #2 on: October 03, 2013, 02:34:23 AM »
+2 on the tuneup. I am battling fuel issues right now with crap in the tank.

Also go over the intake tract - all the pre-turbo & post turbo hoses in addition to the vacuum lines, vacuum & boost leaks will wreak havoc on these cars.
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


CapriXR2

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Re: Hesitation and idle stumble
« Reply #3 on: October 05, 2013, 02:55:47 PM »
I changed my timing from 12 to 10 to 8 BTDC. Plugs are new, wires are good I should check my disty... Timing belt has less than 5k on it.. In the process of replacing intake piping with custom hard pipe. Will also have larger recirc.
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CapriXR2

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Re: Hesitation and idle stumble
« Reply #4 on: October 09, 2013, 11:44:09 AM »
New fuel filter still does it.. Looking for a good write up on how to test our vaf
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Rocketman

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    • 91 BPT AWD Capri & 1991 XR2
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Re: Hesitation and idle stumble
« Reply #5 on: October 09, 2013, 01:38:30 PM »
www.techcapri.com has service manual scans, and Tonlaw71 has some on a Google Drive somewhere. There will be a table for testing it with a multimeter
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


CapriXR2

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Re: Hesitation and idle stumble
« Reply #6 on: November 12, 2013, 01:35:44 AM »
I have replaced my intercooler, intake pipes and recirc valve. Now the car runs great! It feels crisp and strong. My stock recirc had oil in it.. I think it was causing my hesitation.
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Rocketman

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Re: Hesitation and idle stumble
« Reply #7 on: November 12, 2013, 05:49:49 AM »
Thanks for the update! Did the other stuff have oil in it? That could be a sign of a worn out turbocharger.

Sounds like you may have have had a leak in the intake tract somewhere. An oily bypass valve will not cause a hesitation like that.
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


CapriXR2

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Re: Hesitation and idle stumble
« Reply #8 on: November 12, 2013, 11:43:19 AM »
The old charge tubes/ intercooler were clean. The vacuum hose for the recirc had oil in it..
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