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Author Topic: Car stumbles around 2800-3200 RPMs  (Read 2959 times)

blackhandbeagles

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    • 91 xr2
Re: Car stumbles around 2800-3200 RPMs
« Reply #15 on: January 17, 2017, 01:44:00 PM »

Another guy described this perfectly, except I also get it when I slightly let off of the gas.

Here is the quote from him.

"To better explain the problem, if I'm cruising and hit the throttle slowly it sometimes feels like a bogging, or like somethings holding the car back, then a little more gas and it boosts up and seems fine, it doesn't do it all the time, and if you are on it hard all the time you don't even notice it. But it makes crusing in 5th a pain in the ass.

Anymore ideas? got a good fuel pressure reading, but I'm about to put a new fuel pump in it anyway just to see if it helps."
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blackhandbeagles

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Re: Car stumbles around 2800-3200 RPMs
« Reply #16 on: January 18, 2017, 09:28:15 AM »

Drove yesterday for 55 miles with the TPS disconnected. Car stopped searching for idle and the stumbling issue went away. I replaced the TPS with a "known good" unit I bought from Ebay.

I need to do some reading. I suspect that when I disconnect the TPS that stops the car from running a program(don't know how else to describe it) that involves other components. Maybe I can figure out what the TPS works with to control fuel/air/idle.
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Gaz

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    • 92 XR2, 96 Outback, 77 KZ650
    • Saint Cloud Exhaust
Re: Car stumbles around 2800-3200 RPMs
« Reply #17 on: January 19, 2017, 01:24:17 AM »

But that did correct the issue?
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blackhandbeagles

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    • 91 xr2
Re: Car stumbles around 2800-3200 RPMs
« Reply #18 on: January 21, 2017, 01:16:39 PM »

Sorry, I wasn't clear. I had already replaced the TPS with a used one. No, the problem still exists. If I figure it out I will try to give you guys the resolution.
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blackhandbeagles

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Re: Car stumbles around 2800-3200 RPMs
« Reply #19 on: January 22, 2017, 10:56:32 AM »

I found this in the 91 service manual.

"Injector time is controlled by the ECU, based on information supplied by the Vane Air Flow meter, coolant temp sensor, and Throttle Position Sensor."

I don't have a VAF sitting around. I can order the coolant temp sensor. I am going to try to remove clean the VAF and see if that helps.
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blackhandbeagles

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Re: Car stumbles around 2800-3200 RPMs
« Reply #20 on: January 22, 2017, 03:41:59 PM »

Ok, stupid question. Has anyone tried replacing the coolant temperature sensor to fix this problem?
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greywolf27030

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    • 88 Festiva, 67 Chevy C10, 91 Capri,
Re: Car stumbles around 2800-3200 RPMs
« Reply #21 on: January 22, 2017, 04:36:34 PM »

Be sure and use the proper cleaner.

Jack Byrd
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blackhandbeagles

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    • 91 xr2
Re: Car stumbles around 2800-3200 RPMs
« Reply #22 on: January 22, 2017, 04:58:06 PM »

I guess I don't understand. What do you mean "proper cleaner"?
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greywolf27030

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    • 88 Festiva, 67 Chevy C10, 91 Capri,
Re: Car stumbles around 2800-3200 RPMs
« Reply #23 on: January 23, 2017, 10:24:32 AM »

I guess I don't understand. What do you mean "proper cleaner"?

The VAF is an electrical component and can react negatively is the wrong cleaner is used on it.  There are specific cleaners made for a VAF, do not use throttle body cleaner or brake cleaner, for instance.\

Jack Byrd
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blackhandbeagles

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Re: Car stumbles around 2800-3200 RPMs
« Reply #24 on: January 23, 2017, 11:53:07 AM »

Okay, got it. I went to my mechanic friend and he thinks VAF. I will try to find a good spare first before I try dinking with it.
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Rocketman

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Re: Car stumbles around 2800-3200 RPMs
« Reply #25 on: January 23, 2017, 07:06:03 PM »

I guess I don't understand. What do you mean "proper cleaner"?

The VAF is an electrical component and can react negatively is the wrong cleaner is used on it.  There are specific cleaners made for a VAF, do not use throttle body cleaner or brake cleaner, for instance.\

Jack Byrd

This is good advice in general, but does luckily not apply to the Capri VAF. Many other cars use a MAF which use various schemes to calculate airflow (like the Hot Wire MAF) with exposed elements/sensors and are very sensitive to dirt and cleaner residues
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


greywolf27030

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Re: Car stumbles around 2800-3200 RPMs
« Reply #26 on: January 24, 2017, 05:27:19 PM »

Thanks

Jack Byrd
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LarryC

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Re: Car stumbles around 2800-3200 RPMs
« Reply #27 on: January 29, 2017, 03:11:55 PM »

My Capri had 'stumble' problems for such a long time.  The 'Stumble' was more like the car was struggling for gas or electricity (usually when accelerating).  I read here, I think Russ said it was a ground wire problem.  After reading the suggestion, I added another ground wire to the engine.  It helped but, still the 'stumble'.
A couple of months, ago, my brakes were locking (up).  I did my internet mechanical homework, most sites said my brake problem was the master cylinder.  Lucky 'Rock' auto parts had the part, after receiving the new cylinder, I took the car to the car repair shop. A few days later, 'Tye', the mechanic calls me and tells me he cant bleed the brakes because the 'Brake pressure switch' is leaking.
Guess what? No one makes or sells these plastic switches.  'Tye' searches the local junk yards for 2 months, he cant find any suitable switches. I ask the mechanic if we can just plug it, but he tells me he cant because a different thread.
Lucky me, in 'Ebay', someone is selling a used complete MC for about $60. (sorry, Colin). My mechanic puts the ebay MC switch on the Rock auto MC body.
Guess what? the car runs great, no hesitations (or stumbles) when accelerating.  me and my neighbors guess, is somehow the bad switch caused the electronics to falter?  Also, the radio is not working, maybe a coincidence? Im happy to have a good running car, now, I'm not gong to even check the radio fuse.     
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Gaz

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    • 92 XR2, 96 Outback, 77 KZ650
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Re: Car stumbles around 2800-3200 RPMs
« Reply #28 on: January 30, 2017, 09:16:35 PM »

Just a two wire brake switch, innit?
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Rocketman

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Re: Car stumbles around 2800-3200 RPMs
« Reply #29 on: January 30, 2017, 10:06:28 PM »

I'm going to go out on a limb and say there may have been a poor connection somewhere, and in the process of conducting the necessary surgery to replace the BMC the magic combination of pokes, prods, and re-fastening of harness connectors may have fixed the issue.

The main engine harness plug in the engine bay is quite close to the BMC/booster.
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


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