220 turbo loss of power

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engtmitc
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220 turbo loss of power

#1 Post by engtmitc » Sun Sep 26, 2021 9:09 pm

Car has been restored and fitted with wasted spark ignition and wiring loom(and presumably ECU) from a 620/820 vitesse sport post-96. Yes it's this one https://www.rover200.org.uk/forums/view ... 11&t=14138

Intermittently, it loses power such that you can only get up to 40-50 mph on the flat but if you press harder on the accelerator it slows down (as if you have lifted off the accelerator). If you stop, switch off, wait and drive off again it is OK for a while then starts again.

Car had the throttle potentiometer replaced a few months ago. I am trying to contact the previous owner to see if the wiring loom still includes the 600/800 diagnostic plug as it does not have the R8 3-pin plug from a dizzy 220 turbo. Incidentally it smokes on overrun (had a top end rebuild, the turbo was apparently a known good one but not new/recon), but I was going to take the car off the road over the winter and get that fixed next year, when I can get the car back from the garage who are scratching their heads, I don't think they have done any investigative work yet as they can't find the diagnostic plug.

I have tried resetting the stepper motor but doesn't solve it. Have trawled the RCOC faceache page (am not a full member of the forum), this forum and a R800 faceache page - suggesting various things e.g. blocked cat [see above RE smoking..? as this will damage the cat eventually?]/exhaust, fuel pump, injectors blocked, ignition coil, dirty throttle body, boost leak, CTS, crank sensor (not sure about this as I had a 214 with this, symptoms very different)...any ideas? Unless we can find the diagnostic plug!

Interestingly it seems a bit like this, including the odd buzzing noise from the back of the car (sounds like an electrical substation) but not the starting problem:
https://www.rover200.org.uk/forums/view ... =19&t=2078
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RoverRevival
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Re: 220 turbo loss of power

#2 Post by RoverRevival » Mon Sep 27, 2021 6:24 am

My money would be on the fuel pump.
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engtmitc
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Re: 220 turbo loss of power

#3 Post by engtmitc » Thu Oct 07, 2021 7:08 pm

Thanks, have relayed that to the garage who are starting from first principles fuel/spark/etc etc but I did mention to them the buzzing from the back of the car.
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engtmitc
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Re: 220 turbo loss of power

#4 Post by engtmitc » Thu Oct 21, 2021 8:12 pm

Garage now seeking quote for a special pipe in order to test the fuel pressure...
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RoverRevival
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Re: 220 turbo loss of power

#5 Post by RoverRevival » Fri Oct 22, 2021 6:58 am

Special pipe :S

A basic fuel pressure tester kit has the pipe in it, or should I say mine did.
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Re: 220 turbo loss of power

#6 Post by engtmitc » Sat Oct 23, 2021 10:55 am

Apparently they can't find a pipe/connection that fits.
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Re: 220 turbo loss of power

#7 Post by RoverRevival » Sat Oct 23, 2021 1:16 pm

This is the one I have, so I know it has the pipe you need and not exactly expensive.

https://www.ebay.co.uk/itm/Universal-Fu ... 635-2958-0
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engtmitc
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Re: 220 turbo loss of power

#8 Post by engtmitc » Wed Oct 27, 2021 4:55 pm

Apparently that pack does not have the right adaptor for the car so garage now making one themselves.
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Re: 220 turbo loss of power

#9 Post by RoverRevival » Wed Oct 27, 2021 9:33 pm

It’s currently hooked up to an 820 so I fail to see how it doesn’t have the pipe… :rolleyes
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Re: 220 turbo loss of power

#10 Post by engtmitc » Mon Nov 15, 2021 12:04 pm

Edit, garage have driven the car over the weekend and don't believe its fuel pressure but I am asking them more questions based on what's being posted elsewhere. Garage said fuel pressure is OK when the fault occurs.

When the fault is not happening it doesn't seem to lack sufficient boost, when it is occurring it doesn't seem like boost cut which is like a sharp misfire I understand?
Last edited by engtmitc on Mon Nov 15, 2021 5:22 pm, edited 3 times in total.
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Re: 220 turbo loss of power

#11 Post by RoverRevival » Mon Nov 15, 2021 2:07 pm

boost cut, does it have a manual boost controller?
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engtmitc
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Re: 220 turbo loss of power

#12 Post by engtmitc » Mon Nov 15, 2021 3:18 pm

AFAIK no it does not, no visible knob or gauge. Perhaps those who were involved in the build could confirm, but it drives as if the boost comes in gradually/further up the rev range as opposed to the little kick at 2500rpm that I've experienced with my previous ones with a manual controller and gauge.
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Re: 220 turbo loss of power

#13 Post by RoverRevival » Mon Nov 15, 2021 8:54 pm

It may also be the actuator on the turbo failing, there is a little rubber diaphragm inside that can sometimes get perforated.
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Re: 220 turbo loss of power

#14 Post by engtmitc » Tue Nov 16, 2021 7:15 am

When the fault occurs, when driving you can only push the accelerator so far so that you get to c 50 mph then if you push it further the car slows down (loses power). Stationary you can only rev to c.3.5K rpm then if you push the accelerator further it returns to idle.
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Re: 220 turbo loss of power

#15 Post by RoverRevival » Tue Nov 16, 2021 7:50 am

When was the fuel filter last changed?
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