 Very Rough, Low Idle and Missing - Help!, 73 D-Jet - SOLVED! |
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| ThinAir |
  Aug 22 2012, 11:08 PM
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#1
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Best friends  Group: Members Posts: 2,564 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region 
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RRC is only a couple of weeks away and I'm beginning to get desperate that I'm not going to be able to drive my 914.
When I posted this, my problem was just that the idle would hunt, but otherwise it drove well. After reading the responses and reviewing Brad Anders' stuff again it made sense that my hunting problem was probably that I was just running lean. I turned the ECU 3 clicks clockwise to see if that would improve things, but it didn't seem to. Well, things have gone from poor to bad. Right now I've got a car that barely idles at all, and when I'm accelerating or driving on the highway it often bucks/misfires. I haven't run it long enough to get it warmed up. I've tested the AAR by pulling the supply hose and it seems to be working. If I remove the AAR output hose the RPMs go up to 1000 so perhaps the AAR isn't opening fully. I've measured the ohms on the CHT at 124 so that's within range, and I've got a brand new 270 ohm resistor inline. I have 3 MPS units that all pass on resistance and vacuum and changing them makes no difference in the behavior. I've also recently replaced the spark plug wires (not to solve this problem, but just because) and I've made sure that they are as far away as possible from the MPS unit. I've also checked every electrical connection that I can find. Sorry that all that is so long - any clue what I should be looking at? I'm beginning to panic (IMG:style_emoticons/default/blink.gif) |
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| ThinAir |
Aug 28 2012, 10:43 PM
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#2
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Best friends Group: Members Posts: 2,564 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region
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WOOOOOOHOOOOOOO!!!!!!!!!! (IMG:style_emoticons/default/w00t.gif) (IMG:style_emoticons/default/w00t.gif) (IMG:style_emoticons/default/w00t.gif) (IMG:style_emoticons/default/w00t.gif) !!!!!!!!
Replacing the distributor did the trick. Of course I don't know yet which part of the distributor caused the problem, but with the spare distributor in place the car runs as smooth as butter. I put about 50 miles on it tonight and it never burped or hiccuped even once. Besides that, the idle never did the drop/rise thing when I stopped for a traffic light. Warmed up, it idles nice a smooth at 950 and there are no changes to the rhythm of the exaust at idle when I hold my hand behind the tailpipe. I'll be checking the vacuum on the distributor can, but I really suspect the injector points are the issue. Fortunately, I have a spare set that is supposedly good, but I doubt that I'll have time to test them out before RRC due to the Labor Day weekend. When I started on this, I suspected anything other than the distributor since I had it professionally rebuilt just a few hundred miles ago (last summer), and that included setting the injector points. These are old cars and things happen so even when it's not what I expect, I'm never surprised. Thanks to all of you for your help and advice! Okay, now it's time to (IMG:style_emoticons/default/driving.gif) - Beaver, UT here we come! |
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| DRPHIL914 |
Aug 29 2012, 06:48 AM
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#3
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Dr. Phil Group: Members Posts: 5,821 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States
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Great news, i am not surprised. I have chased my tail 3x only to find out it was a issue with the injector triggers gettng dirty or worn. It will act like bad gas or a bad ground etc. (Thats why i suggested it last weekend) but you also know you have all the other stuff you ruled out that is good to go! It gets very frustrating but rewarding at the same time!
QUOTE(ThinAir @ Aug 29 2012, 12:43 AM)  WOOOOOOHOOOOOOO!!!!!!!!!! (IMG:style_emoticons/default/w00t.gif) (IMG:style_emoticons/default/w00t.gif) (IMG:style_emoticons/default/w00t.gif) (IMG:style_emoticons/default/w00t.gif) !!!!!!!! Replacing the distributor did the trick. Of course I don't know yet which part of the distributor caused the problem, but with the spare distributor in place the car runs as smooth as butter. I put about 50 miles on it tonight and it never burped or hiccuped even once. Besides that, the idle never did the drop/rise thing when I stopped for a traffic light. Warmed up, it idles nice a smooth at 950 and there are no changes to the rhythm of the exaust at idle when I hold my hand behind the tailpipe. I'll be checking the vacuum on the distributor can, but I really suspect the injector points are the issue. Fortunately, I have a spare set that is supposedly good, but I doubt that I'll have time to test them out before RRC due to the Labor Day weekend. When I started on this, I suspected anything other than the distributor since I had it professionally rebuilt just a few hundred miles ago (last summer), and that included setting the injector points. These are old cars and things happen so even when it's not what I expect, I'm never surprised. Thanks to all of you for your help and advice! Okay, now it's time to (IMG:style_emoticons/default/driving.gif) - Beaver, UT here we come! |
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Posts in this topic
ThinAir Very Rough, Low Idle and Missing - Help! Aug 22 2012, 11:08 PM
tim_nd Have you pulled and inspected your plugs? Aug 22 2012, 11:28 PM
ThinAir
Have you pulled and inspected your plugs?
That... Aug 22 2012, 11:39 PM hot_shoe914 Check the points to while you are at it. Aug 23 2012, 07:04 AM Philip W.
Check the points to while you are at it.
:agree... Aug 23 2012, 07:56 AM jsconst The bucking and misfiring at speed might be the co... Aug 23 2012, 08:31 AM Michael N
The bucking and misfiring at speed might be the c... Aug 24 2012, 08:31 AM ThinAir
The bucking and misfiring at speed might be the ... Aug 24 2012, 09:19 AM ThinAir Update: Tonight I pulled all the spark plugs, chec... Aug 24 2012, 12:33 AM Bartlett 914 I suspect you may have some bad gas. Aug 24 2012, 09:06 AM The Cabinetmaker Unplug the tps. If it runs better, contact davesp... Aug 24 2012, 09:35 AM jsayre914
Unplug the tps. If it runs better, contact daves... Aug 24 2012, 12:09 PM StratPlayer I got a new board from dave and it doesn't fun... Aug 24 2012, 10:12 AM jsayre914 p.s.
I am dealing with the similar issues, my car... Aug 24 2012, 12:12 PM tim_nd Go ahead and replace your plugs with some freshy... Aug 24 2012, 12:32 PM tim_nd I also had slight misses at idle. I replaced the ... Aug 24 2012, 12:48 PM Philip W.
I suspect you may have some bad gas.
Bad Gas is ... Aug 24 2012, 02:04 PM shoguneagle Ernie,
Thought I would drop into your thread and ... Aug 24 2012, 05:51 PM 76-914 :confused: any news? Aug 26 2012, 03:35 PM ThinAir Well the news is that I keep eliminating things so... Aug 28 2012, 12:14 AM 76-914 That fuel filter isn't that difficult to R... Aug 28 2012, 07:55 AM ThinAir One more thing....
I'm still running the 012 ... Aug 28 2012, 10:51 PM AZ914 Awesome Ernie!
:Qarl: Aug 29 2012, 07:46 AM 76-914 :thumbsup: Aug 29 2012, 08:29 AM |
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