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Author Topic: Misfire Under Heavy Acceleration  (Read 43651 times)

Gostlrs

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Misfire Under Heavy Acceleration
« Reply #30 on: June 05, 2013, 03:00:00 AM »

Yes, run the line from that red arrow to the wastegate. If the car is still overbooting then you have either a boost leak or the wategate actuator is bad.

Assuming all the other vacuum lines are correct as you believe.
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SuperSport346

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Misfire Under Heavy Acceleration
« Reply #31 on: June 05, 2013, 03:52:00 AM »

What might cause a boost leak and how could I check for one?
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1991 Capri XR2 - Red 5-Speed
2002 Camaro SS - Black 6-Speed
2000 Wrangler - Yellow
2001 Silverado Z71 - Pewter

Gostlrs

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Misfire Under Heavy Acceleration
« Reply #32 on: June 05, 2013, 04:08:00 AM »

You can make a cheap tester. Google it, can be made with Home Depot things for like 10-15 bucks. You tube videos will show you want to do.

Basically its a leak of the intercooler lines. Maybe even a vacuum leak as well. Can be a bad intercoller, couplers, throttle body, intake manifold. seen all leak.
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SuperSport346

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Misfire Under Heavy Acceleration
« Reply #33 on: June 21, 2013, 06:26:00 AM »

Well I didn't get right back to updating this, but the Capri is running just fine now.  The shop did a boost leak test and re-checked the wastegate.  They attempted to remove it to install the wastegate off the old turbo, but said they couldn't do it without removing the turbo, which I wasn't going to pay them to do.

I took the car home, and decided to drive it to work the rest of the week, and I'll be damned if it didn't start working like it should.  The wastegate must have been sticking, and they got it to open without realizing it.
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1991 Capri XR2 - Red 5-Speed
2002 Camaro SS - Black 6-Speed
2000 Wrangler - Yellow
2001 Silverado Z71 - Pewter

Rocketman

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    • 91 BPT AWD Capri & 1991 XR2
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Misfire Under Heavy Acceleration
« Reply #34 on: June 21, 2013, 02:31:00 PM »

Glad it's running good, thank you for the update! Hopefully no more issues.
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


Gostlrs

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Misfire Under Heavy Acceleration
« Reply #35 on: June 23, 2013, 12:00:00 AM »

Cool
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Jim Simms

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Re: Misfire Under Heavy Acceleration
« Reply #36 on: January 03, 2014, 03:21:45 AM »

The original question seemed to be misfire at hard acceleration, maybe 3000rpm.
I am no mechanic, and defer to Russ and others, but I had the same problem for a couple of years. The car would hesitate and jerk a bit as I was accelerating, mostly in 5th gear. My remedy? I started changing out vacuum hoses, beginning from the carbon canister on the passenger side firewall, and worked my way to the driver side. Be very careful as you disconnect the hoses. Some of the parts are plastic, and I did break off the end of a solenoid (Russ got me another). I replaced about 5-6 hoses.  The problem ended. I never knew which hose was causing the problem.
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