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> 1.7 dies right after starting
averagejoe71
post Apr 3 2017, 01:02 AM
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my 1.7 dies when it starts. Ill turn the key and it will shortly after stop and if i touch the pedal alittle within the small time frame it dies. Does anyone have any ideas of where to start checking to see whats the problem. All help is appreciated.
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averagejoe71
post Jun 8 2017, 05:04 PM
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QUOTE(The Cabinetmaker @ Jun 8 2017, 03:51 PM) *

The adjustment knob is located on the top, drivers side, of the ecu. It may have a rubber cover over it.

I can still turn it clockwise.
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Rand
post Jun 8 2017, 05:05 PM
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When I disconnect the hose the car intermittently starts to die.

From post #1 of this thread, I thought it was always dieing right after start? With MPS connected does it run longer? Is the behavior similar, or is it VERY different depending on that hose connection?
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averagejoe71
post Jun 8 2017, 05:13 PM
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QUOTE(Rand @ Jun 8 2017, 04:05 PM) *

QUOTE
When I disconnect the hose the car intermittently starts to die.

From post #1 of this thread, I thought it was always dieing right after start? With MPS connected does it run longer? Is the behavior similar, or is it VERY different depending on that hose connection?

https://youtu.be/fpqJ-JvSSGs
Heres a video of what's happening. I couldn't make It in time to disconnect the mps.
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TheCabinetmaker
post Jun 8 2017, 05:48 PM
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Unplug the mps BEFORE starting it!
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Rand
post Jun 8 2017, 05:51 PM
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It's way rich!!

I guess to ask my question another way, if the MPS hose is disconnected first, does it behave differently upon/after start?
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TheCabinetmaker
post Jun 8 2017, 07:23 PM
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Like beat navy said on page one, you need a wide band O2 or some dyno time to tune the mps. Otherwise, you'll chase this forever. I'm not guessing. I'm speaking from experience.
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averagejoe71
post Jun 12 2017, 04:37 PM
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QUOTE(The Cabinetmaker @ Jun 8 2017, 06:23 PM) *

Like beat navy said on page one, you need a wide band O2 or some dyno time to tune the mps. Otherwise, you'll chase this forever. I'm not guessing. I'm speaking from experience.

Dang okay. I guess I'll get to work on replacing the tuning screw on the MPS. Also here's the video on the car starting with the mps vacuum line disconnected. https://youtu.be/vtgNhgLVtvs
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Rand
post Jun 12 2017, 05:00 PM
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Holy cow, if it runs that long with the MPS disconnected, I'd think there must be a massive vacuum leak below below the butterfly in the throttle body to keep it running as long as it did. I'm still trying to wrap my head around the idea that it would die sooner with the MPS connected. It sure sounds rich in that video with the MPS disconnected (as I would expect), but it should run better when you connect the hose. Unless the other end of that hose isn't connected where it should be? That hose should be pulling vacuum at idle, which would pull on the diaphragm of the MPS to lean it out.

If you start it just like that last video with the hose disconnected, then reconnect the hose before it does, does anything change as you reconnect it?
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averagejoe71
post Jun 12 2017, 06:02 PM
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I hit another wall. I messed when putting in the new top screw so now the her opening stripped. Does anyone know where I can buy a used mps. I don't know how this happened. It was turning in so smoothly.
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914_teener
post Jun 12 2017, 10:39 PM
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QUOTE(averagejoe71 @ Jun 12 2017, 05:02 PM) *

I hit another wall. I messed when putting in the new top screw so now the her opening stripped. Does anyone know where I can buy a used mps. I don't know how this happened. It was turning in so smoothly.
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It's not a wall it's time to stop and take one step at a time.

There are plenty of cores around. I'd give you mine but I keep one as a spare.

You seem like you are in a hurry for this? If you are don't be.

Find a core and have Jeff Bowlsby set it up for you....cost you a little money....yes..but it will be near what is a stock setting. Make sure it holds vaccum to 12 psi at least and will hold that. You already know it shouldn't leak down.

Then make sure ALL the vaccum leaks are sealed. That car should not run with the MPS uplugged like that. The ECU would interpret that as WOT and gas would be coming out of your exhaust. So you have other stuff either not right .....or you have broken stuff that wasn't broke in the first place and have to start over.
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914_teener
post Jun 12 2017, 10:46 PM
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It just struck me looking at your picture is that there is nothing holding that cap on the MPS on.

Where are the rivets or screws that hold it on? Did you take them out?
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averagejoe71
post Jun 12 2017, 11:14 PM
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QUOTE(914_teener @ Jun 12 2017, 09:46 PM) *

It just struck me looking at your picture is that there is nothing holding that cap on the MPS on.

Where are the rivets or screws that hold it on? Did you take them out?

I took the screws off since I was taking off the cap 4 or 5 times to make sure I didn't do anything wrong.
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rhodyguy
post Jun 13 2017, 10:42 AM
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Post the # on the MPS?
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Beach914
post Jun 14 2017, 07:57 AM
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I've got a few. Depending on the number you can get one from me. Send me a PM.

David
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