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| Mixture control unit removal help | |
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| Tweet Topic Started: Mon Jun 7, 2010 1:35 am (1,282 Views) | |
| zhenya | Mon Jun 7, 2010 1:35 am Post #1 |
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Newbie
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In trying to troubleshoot my stalling issue on my 16v 2.3 I've determined that the air flow plate is sitting a little low. For that reason I am trying to remove the mixture control unit to reset the plate height as well as to have an opportunity to inspect the rubber boot for tears. I'm almost there, but have two items still holding the unit in. First is this unidentified hose, which was underneath the fuel pressure regulator, between the intake runners, connecting to the mixture control unit. It has a rubber hose, apparently press fit on to a hard line. Wanted to be sure what this was, and how to replace it before I remove it, as it does not want to come off, and started to tear when I pushed on it a bit with a screwdriver. Hose in question is in the center of the picture. ![]() The second piece still holding the unit in is one of the mounting brackets for the throttle control cable on the rear of the unit near the firewall. I got all the other mounting bolts off, but this one is starting to strip. It's currently soaking in plenty of penetrating oil, but I was wondering if there was any other way to detach the throttle cable if that won't come off? Plate resting height at measurement position. Looks low to me. Agree? ![]() Appreciate the help all! Edited by zhenya, Mon Jun 7, 2010 3:15 pm.
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| cosser | Mon Jun 7, 2010 6:56 pm Post #2 |
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Part of things
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Hi Zhenya, you can detatch the cable itself by pressing the plastic clips that the cable runs through out of the the carrier.This is what you do when you need to replace the cable.I'll see if I've got one of my handy screenprints to help..lol..!! I can't get into photobucket at the moment sorry..but it's pretty straightforward anyway..just push the cable forward out of the square plastic grommets and pinch them to remove and then guide the cable backwards through the hole after the grommets are out..!! Cosser..!! Edited by cosser, Mon Jun 7, 2010 7:08 pm.
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| zhenya | Mon Jun 7, 2010 8:33 pm Post #3 |
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Newbie
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ok, thanks cosser. I was looking at that option, but didn't want to remove anything that I might not be able to get back together. I'll give it a try if this bolt doesn't come off tonight. Anyone who can identify this fuel line above? thanks! |
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| Johnboy Mac | Mon Jun 7, 2010 9:43 pm Post #4 |
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More than part of things
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Zhenya, the from my understanding that plate looks o.k. to me, as there should be something like a 0.5mm gap alround between the plate and the housing. Hopefully somebody else can verify. |
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| zhenya | Tue Jun 8, 2010 3:05 am Post #5 |
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Newbie
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Ok, I got the unit off tonight - I was able to unbolt the bracket holding that fuel line rather than try to disconnect the rubber, and I pushed the throttle cable clips out as per Cosser's tips above. So far so good. No tears in the rubber boot, just cleaning everything up and going to get some replacement screws for the ones that were questionable or stripped coming out, then it'll start going back together. Johnboy - there needs to be a 0.05mm gap around the edges of the plate. That has already been set - I was able to get a long strip of .05mm feeler stock from our machine shop at work making it much easier, as I could put multiple pieces around the perimeter. I do believe the resting height is incorrect, however. According to the factory manual, "the top edge of the sensor plate must be level with the top edge of the cylindrical part of the air funnel. A position up to 0.2mm higher is permissible": ![]() The measurement point: ![]() It appears to me that my plate is resting considerably lower than the top edge of the cylindrical part of the funnel. Now I'm not 100% certain I'm looking at this right, as this is the only k-jet car I've ever worked on - but that's why I'm asking here! ![]() Also noted is that (when in the rest position) "a clearance of 1-2mm must exist when the air flow plate is pressed as far as the control plunger." My plate (when installed and pressurized), has no clearance. It is pressuring the plunger at all times. I am suspecting this may be partially responsible for the stalling, as even at rest (idle) there is some pressure against the plunger, which would cause the fuel pressure to bleed off. Also, with the car at idle, if I pull upwards on the plate slightly by using a magnet, the idle noticeably improves. Again, I could use some feedback from anyone who has dealt with this thing before as I've never worked on k-jet before; I'm just going from what I can gather via reading and examining the parts. I'd like to get this back together right the first time.
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| balamb37 | Tue Jun 8, 2010 4:30 pm Post #6 |
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Grumpy Old Grampa with Dog
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It looks to me as if your plate is too low which means that the pin has been knocked to far in. I would be inclined to follow the instructions and 'reset' the 'Zero position'
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| zhenya | Tue Jun 8, 2010 8:18 pm Post #7 |
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Newbie
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Thanks balamb37. That's what I'm inclined to do - just hoping to get some experienced eyes on it before it goes back together. Should have another couple of days or so yet as I am trying to source some replacement bolts and screws before I put it back in. |
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