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Old 09-11-2004, 16:20   #1 (permalink)
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Urgent MPFI help

Ok well ive pretty much got all the stuff connected. but it wont start :( i dont know what it could be but here is a list
I still have the cfi fuel pump in? Would that cause it not to fire, it cranks though

Battery voltage is 12.4 off and when i turn the key it goes down to 10.5.. is the battery flat??

Does this plug have to go somewhere??
http://users.on.net/~bdunn/plug.JPG

And also im trying to start it without this?? will it work without it?
http://users.on.net/~bdunn/hose.JPG
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Old 09-11-2004, 16:32   #2 (permalink)
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Re: Urgent MPFI help

I dunno anything about doing the mpfi mod.
I cant tell what the plugs off in the 1st photo .. use a wiring diagram if you have one, if not just look for a socket with the same colour wires and plug it into that.

In your 2nd photo .. If no vacuum hoses are meant to be connected, just block it off.
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Old 09-11-2004, 17:57   #3 (permalink)
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Re: Urgent MPFI help

i remember something about switching two wires on an ECU power relay. Mabey one of the CFI==>MPFI gurus can help.
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Old 09-11-2004, 17:59   #4 (permalink)
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Re: Urgent MPFI help

If it cranks at normal speed then the voltage shouldn't be a problem.

You need to be provide a few more details about what's happening, does it have fuel? Does it get spark? Spark can be checked by pulling any lead out and putting an old spark plug in, if you get a spark while cranking you have spark. For fuel, try and smell whether there is fuel coming out the exhaust when you're cranking. Also listen for the fuel pump.

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Old 09-11-2004, 18:05   #5 (permalink)
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Re: Urgent MPFI help

Ok Im pretty sure its getting fuel because i released all the pressure from the lines yesterday and when i took it off today there was fuel in it.
With spark Im not sure i dont have a spare plug is there any otehr way to check?

Do i also have to plug that plug in somewhere.. i can find anywhere for it to go

ANd i need to connect the brake booster hose.. would that stop it??

ANd for the wiring i took the grey/white wire from the isc plug and put it to the main plug? i assume that was right
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Old 09-11-2004, 18:16   #6 (permalink)
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Re: Urgent MPFI help

Yeah that's all sweet.

For spark you could also try pull the sleeves on the leads back, to reveal the socket conductor thing. Put it about 2mm from the rocker cover and see if there's spark.

That plug could be for the TP or ACT sensors. TPS is on the throttle body, the ACT is tapped in to the side of the plenum that faces the block. You could get to it from underneath. I see that your hoses on the vacuum tree aren't all there....you do have the regulator hose hooked up?? I don't know if that'd affect starting though...

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Old 09-11-2004, 18:30   #7 (permalink)
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Re: Urgent MPFI help

Ok i will check the spark now

So your saying it has to be plugged in or it wont work?

ANd yeah im getting a new brake booster hose
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Old 09-11-2004, 18:46   #8 (permalink)
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Re: Urgent MPFI help

Not really, without those sensors it'll probably dump more fuel in when you're cruising around. I drove around without my TPS connected for a few months and every time I caned it I noticed a massive cloud of black smoke behind my car. I only found out it was disconnected when I changed the manifold.

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Old 09-11-2004, 20:10   #9 (permalink)
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Re: Urgent MPFI help

In the 2nd pic the plug on your left goes to the brake booster (unsure if theat would cause an issue but if you can't connect it, block it for now). The plug on the far right goes to the top of the fuel regulator, so I imagine that vacum line would be rather important to be connected to get fuel into the fuel rail.

I had the MPFI conversion done on my car but don't know all as I got mates to install it.
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Old 09-11-2004, 20:15   #10 (permalink)
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Re: Urgent MPFI help

can you find if that plug connects to anything?
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