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Old 05-08-2018, 09:00 PM   #1
Broomel
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Default 1.8 vvc teething issue

Hi all,

I eventually got my vvc installed and running, however I have the following issues:

1) the idle seems to stay around 1100 - 1300 rpm, sometimes higher but a blip on throttle will drop to the rpm mentioned above. i have tried several throttle position resets but it makes little to no difference. the annoying thing is my old non vvc engine did this and I never resolved it.

2) under no load the engine will not rev freely, it hesitates throughout the rev range. while driving it will rev correctly, however will sometimes also hesitate under a sudden application of full throttle for a split second or so
I think it smells a bit rich but that might be the fumes getting to me.

I just want your opinions if this sounds like a map or tps issue?

cheers guys.
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Old 05-08-2018, 09:17 PM   #2
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Default 1.8 vvc teething issue

When I first fitted an adjustable fuel regulator years ago I had the fuel pressure a fraction high and it made the car bog down and hesitate a lot when you stamped on the pedal or at higher RPM.
Overfueling can be caused by a duff sensor, the most common one would be the brown temp sensor.
That could also be the cause of your high idle, you can listen to the idle control valve to rule that out, when you switch off the ignition, it will reset, you should be able to hear it and it should sound like a smooth whine, if it sounds like itís clicking then itís probably jammed.


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Old 06-08-2018, 06:47 AM   #3
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It’s melonsed it’s a k series ����
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Old 06-08-2018, 08:11 AM   #4
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I would look at the VVC plugs. You are running the MEMS 2 and the wiring is different to the MEMS 3.

Viewed into the engine bay. On the VVC unit the plug is brown. Middle is black. On right is blue.

Other thing that could cause this fault is the Lambda sensor. I assume this is the same one used on previous engine too. You can buy a universal one and cut the wires you have to fit it. A fully wired one is 3 times the price.

Dan is correct saying the coolant sensor to ECU controls the fuel ratio. You can test the wiring to this by removing the plug, turn on the ignition and the fan should come on. Generally they work or not. Nothing in between.
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Old 06-08-2018, 12:06 PM   #5
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I would look at the VVC plugs. You are running the MEMS 2 and the wiring is different to the MEMS 3.

Viewed into the engine bay. On the VVC unit the plug is brown. Middle is black. On right is blue.

Other thing that could cause this fault is the Lambda sensor. I assume this is the same one used on previous engine too. You can buy a universal one and cut the wires you have to fit it. A fully wired one is 3 times the price.

Dan is correct saying the coolant sensor to ECU controls the fuel ratio. You can test the wiring to this by removing the plug, turn on the ignition and the fan should come on. Generally they work or not. Nothing in between.
I do not have an adjustable fuel pressure regulator, I hope that is not the issue.

I thought mine was mems 3 being a 160? I will check the plug colors when I return.

lambda sensor is the item that came with the vvc, I simply fitted it to my old manifold (cut manifold to fit in front end). I notice the plug were different to my old engine loom.

Brown plug also came with the vvc, so it seems it's a case of trial and error sensor replacement ?

but no one is thinking maf sensor or tps sensor ?

same as
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Old 06-08-2018, 12:17 PM   #6
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If you have a red and a black plug on your ECU then you have MEMS2, if itís just black then itís MEMS3, thatís the easiest way to tell, if you have a MEMS3 then ignore Andrews colours as the MEMS3 is different.
I believe the MEMS3 used 2 lambda sensors, a pre cat and post car, you can use just the one, but itís needs to be the post cat sensor.
My comment about the fuel pressure regulator was just to confirm that your symptoms can be caused by overfueling, itís very rare a standard regulator to go wrong but donít completely rule it out, my bogging down was when the fuel pressure was just 0.2 bar over.


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Old 06-08-2018, 01:03 PM   #7
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If you have a red and a black plug on your ECU then you have MEMS2, if it’s just black then it’s MEMS3, that’s the easiest way to tell, if you have a MEMS3 then ignore Andrews colours as the MEMS3 is different.
I believe the MEMS3 used 2 lambda sensors, a pre cat and post car, you can use just the one, but it’s needs to be the post cat sensor.
My comment about the fuel pressure regulator was just to confirm that your symptoms can be caused by overfueling, it’s very rare a standard regulator to go wrong but don’t completely rule it out, my bogging down was when the fuel pressure was just 0.2 bar over.


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Mems3 only requires the pre cat 02 sensor, not the post one

I'd be fitting a new one, they can definitely cause over-fueling, are your plugs black?

If it's mems3 you can connect an obd2 reader and read the error codes if one is being generated.

A misreading o2 sensor causes 'Random misfire detected(low fuel)' followed by bank1 o2 sensor failure when it packs up totally.

You will have a bank2 o2 sensor error but that can be ignored.

These have a map or 'manifold pressure sensor' not a maf (mass air flow). Much better as maf sensor fail as soon as they get wet.

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Old 06-08-2018, 01:04 PM   #8
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Mems3 only requires the pre cat 02 sensor, not the post one



I'd be fitting a new one, they can definitely cause over-fueling


I stand corrected, thanks


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Old 06-08-2018, 02:22 PM   #9
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If it's a 160 running MEMS 3 then the plug colours are black on the VVC control unit. Brown in middle and blue to right. Sorry, thought it was the early type.
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Old 06-08-2018, 10:06 PM   #10
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vvc plugs were as you stated and spark plugs look good to me.

can I unplug the map or lambda sensors whilst running to see if it helps? I'll grab the them switch and throttle body from my old engine for a test also.

if the lambda is faulty (unlikely it spark plugs are good ?) i guess I can just swap the plugs over from my old 1.6 ? mems 1. something.
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Old 07-08-2018, 12:45 AM   #11
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The MEMS 3 lambda sensors are all the same. The plug has an oblong, 4 wires in a line but round at one end plug.

The earlier type have a 2x2 wire, square plug. Obviously this isn't going to fit a later engine.
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Old 07-08-2018, 07:38 AM   #12
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the mems 3 will happily run with the lambda unplugged so thats an easy test. From what you describe I would try a different tps, you say your old engine did this as well - have you used any sensors etc from the old engine?
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Old 07-08-2018, 06:00 PM   #13
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Hi Gazwad, agoaty, custard.

Jackjewell93 read codes today, had 2 stored for both o2 sensors. cleared them and they didnt come back.

unplugged most of the sensors and it made no difference.

Gazwad, all the sensors fitted are from the VVC engine, with an exception of i removed the blue thermo sensor on bottom of the elbow and replaced with my acewell temp sender.

Any final thoughts before i start replacing stuff randomly?

Cheers
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Old 07-08-2018, 07:31 PM   #14
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Only other thing I can think of is an air leak.


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Old 08-08-2018, 01:28 AM   #15
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Test for air leaks by dribbling water over any suspect area. Inlet manifold, breather pipes, fuel injector o rings are most common causes.

Engine will cough or die if water gets in.
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