4A-GE MK1 Engine Do i need this connector? (Pressure regulator?)

ebouwman · 02-26-2009, 01:56 AM

When i did my head gasket there was this blue connector at the end of the string on the injector connectors, when i took the engine apart it wasn't connected to anything so i assumed it was for an accessory i didn't have or something.

Thing is that i was poking around on the net and i saw a picture of it plugged in, so i had to find out what it was.

I pulled it up in the haynes manual, and found out that it's connected to a "pressure regulator vsv"

Is it normal to not have this little vsv?

Here's the pic that i found with it on

It's that BRIGHT blue connector that plugs into the right side of the manifold (from the direction that picture is taken, passenger side)

Should i just leave it be, or should i add it to the list of things that i need to do to my mk1 to get it running just right?

328FTW · 02-26-2009, 05:32 PM

You probably want that little vsv. People run without them but they help control the fuel pressure. If there is ANY sensor missing the general rule is you want it back unless it is an a/c clutch engage or something. ECU controlled engines get a bit touchy about losing their sensors and it leads to running rich, poor idle etc etc.

ebouwman · 02-26-2009, 07:55 PM

Ok, thanks for that, i plugged of my t-vis vsv last week (the nipple broke off) while i'm waiting on my new one, and i noticed a descent decrease in fuel consumption in the short time i drove it, hopefully if i replace that then i can get it back down even more! (and better performance)

Papo J · 02-27-2009, 06:15 PM

That looks like your electrical load idle up VSV, it increases fuel pressure by removing engine vacuum to it when there is a large electrical load like the headlights.

ebouwman · 02-27-2009, 06:42 PM

Quote:

Originally Posted by Papo J

That looks like your electrical load idle up VSV, it increases fuel pressure by removing engine vacuum to it when there is a large electrical load like the headlights.

Every once in a while when i put it in drive, or reverse it stalls out on me (it's an auto) could this be one of the reasons why?

02-26-2009, 01:56 AM	#1 (permalink)
ebouwman Curve Hugger Join Date: Jan 2009 Location: BC Posts: 1,600 Thanks: 19 Thanked 51 Times in 51 Posts My Google Map iTrader Rating: (0/0% )	Do i need this connector? (Pressure regulator?) When i did my head gasket there was this blue connector at the end of the string on the injector connectors, when i took the engine apart it wasn't connected to anything so i assumed it was for an accessory i didn't have or something. Thing is that i was poking around on the net and i saw a picture of it plugged in, so i had to find out what it was. I pulled it up in the haynes manual, and found out that it's connected to a "pressure regulator vsv" Is it normal to not have this little vsv? Here's the pic that i found with it on It's that BRIGHT blue connector that plugs into the right side of the manifold (from the direction that picture is taken, passenger side) Should i just leave it be, or should i add it to the list of things that i need to do to my mk1 to get it running just right?

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02-26-2009, 05:32 PM	#2 (permalink)
328FTW Crazy Nasty Honey Badger Join Date: Aug 2008 Location: New Zealand Posts: 5,222 Thanks: 24 Thanked 266 Times in 239 Posts My Google Map iTrader Rating: (1/100% )	You probably want that little vsv. People run without them but they help control the fuel pressure. If there is ANY sensor missing the general rule is you want it back unless it is an a/c clutch engage or something. ECU controlled engines get a bit touchy about losing their sensors and it leads to running rich, poor idle etc etc.

02-26-2009, 07:55 PM	#3 (permalink)
ebouwman Curve Hugger Join Date: Jan 2009 Location: BC Posts: 1,600 Thanks: 19 Thanked 51 Times in 51 Posts My Google Map iTrader Rating: (0/0% )	Ok, thanks for that, i plugged of my t-vis vsv last week (the nipple broke off) while i'm waiting on my new one, and i noticed a descent decrease in fuel consumption in the short time i drove it, hopefully if i replace that then i can get it back down even more! (and better performance)

02-27-2009, 06:15 PM	#4 (permalink)
Papo J 6SPD GTE Join Date: Sep 2006 Posts: 588 Thanks: 2 Thanked 50 Times in 49 Posts iTrader Rating: (0/0% )	That looks like your electrical load idle up VSV, it increases fuel pressure by removing engine vacuum to it when there is a large electrical load like the headlights.