Author Topic: Its alive! (Read 8914 times)

Rosscoe · « **on:** July 26, 2017, 08:19:32 PM »

So since I am stuck with the gimbal bearing issue I have to move on to other things.
Got it running decent today but it is idling pretty high. I know many?most disconnect their choke. Mine is hooked up. I am not sure if that is the issue. It is not coming down to the idle screw but slows if I force it. I didnt want to let it run long enough to get it to temp on the hose. Maybe it would slow down? I guess I'll disconnect it and see how it behaves. I have a vid to share but I guess its too big?

dorelse · « **Reply #1 on:** July 26, 2017, 10:10:32 PM »

Quote from: Rosscoe on July 26, 2017, 08:19:32 PM

I have a vid to share but I guess its too big?

Videos are, well, complicated to upload to the site directly. I'd recommend uploading to youtube then share it and copy & paste the URL link here...

Plugcheck · « **Reply #2 on:** July 26, 2017, 10:18:39 PM »

Electric choke I assume, could be water regulated or even a heat riser, but operation is the same. If you operated the throttle to set the choke, then when it warms up, you will need to "pump" the throttle to come off the fast idle cam. My outboards keep the chokes, the v8's do not. It is always at least 50+ degrees when I boat, so even in cold weather it runs for a minute at the dock. Never had an issue, maybe a bit stumbly at idle till warmed up. A quick blast at 3500 rpm and it warms up and idles fine. Running till warmed on muffs isn't an issue, running it much above idle continuously might be.

Rosscoe · « **Reply #3 on:** July 27, 2017, 05:11:14 AM »

Heat riser.
Bumping the throttle had no effect. As much as I love the sound of thru hull, it's kind of obnoxious out of the water. Idling around 1600 rpms

Rosscoe · « **Reply #4 on:** July 27, 2017, 05:34:02 AM »

https://youtu.be/Xk1SPmCF4ho

Rosscoe · « **Reply #5 on:** July 27, 2017, 05:52:07 AM »

https://youtu.be/kh1hjwR6304

dorelse · « **Reply #6 on:** July 27, 2017, 09:32:39 AM »

Ok...so...I'm no mechanical wizard, but I would unhook the throttle cable from the engine mount and start the motor and see where it idles. Maybe the throttle cable isn't adjust right and its keeping that idle too high? Or, just start adjusting the idle throttle position down until its where you want it at the transom cable mount bracket. Rich has a great diagram on the proper cable adjustments...worked like a charm on the CVZ.

Rosscoe · « **Reply #7 on:** July 27, 2017, 09:59:15 AM »

Quote from: dorelse on July 27, 2017, 09:32:39 AM

Ok...so...I'm no mechanical wizard, but I would unhook the throttle cable from the engine mount and start the motor and see where it idles. Maybe the throttle cable isn't adjust right and its keeping that idle too high? Or, just start adjusting the idle throttle position down until its where you want it at the transom cable mount bracket. Rich has a great diagram on the proper cable adjustments...worked like a charm on the CVZ.

I did remove the cable. Same thing. Throttle is not returning to the idle screw.

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dorelse · « **Reply #8 on:** July 27, 2017, 10:12:20 AM »

Well...that's all I've got.

Diamond Chad · « **Reply #9 on:** July 27, 2017, 10:27:17 AM »

perhaps it needs percussive maintenance?

Rosscoe · « **Reply #10 on:** July 27, 2017, 12:05:31 PM »

Plugcheck · « **Reply #11 on:** July 27, 2017, 12:25:54 PM »

Well, time to delve into this a bit more. Ford or Chevy? Carb model? Lets assume for a moment that it is a 5.7, 350, Merc 260 with a Quadrajet. You can manually move the heat riser linkage to simulate warm up, then crack the throttle to see if the high idle cam backs down, it should. Another issue very common to Qjets is the throttle shafts on the primaries wear out and introduce a nasty vacuum leak around the throttle plate. Makes for a lean and high idle condition. Not running, if you can wiggle the throttle shaft then its time to re-bush the shafts. Its not the shaft that wears, its the soft aluminum body of the carb itself. Kits comes with the drill bit, bushings, and Loctite. Just a thought, could be the shaft or linkage binding somewhere. You should be able to manipulate the linkage without it running to see if the throttle plate returns to normal position.

Rosscoe · « **Reply #12 on:** July 27, 2017, 05:35:34 PM »

You assumed correctly 5.7 Quadrajet 4 Barrel.
I did fiddle what the choke mechanisms and it didn't seem to make any difference. I guess it would help if I knew exactly where the throttle plates should be normally. It appears like the secondaries are totally closed and the primaries are slightly open. Another thing I noticed is that when I put the carb on I did have to readjust throttle cable to even get it to go on. It's old resting place would have pushed the throttle more forward towards the idle screw.

Rosscoe · « **Reply #13 on:** July 27, 2017, 05:37:26 PM »

Also I did have the carb off a few days ago and the linkage still rested where it is now about 1/8 inch of off the idle screw

Plugcheck · « **Reply #14 on:** July 27, 2017, 06:50:47 PM »

Just a thought, but since you mentioned having the carb off, could the gasket be catching the throttle butterflies? Or on some manner binding up the linkage? Loosen the mounting bolts, adjust, and test. Butterflies should be closed at idle to allow idle and transition circuits to work properly.

Rosscoe · « **Reply #15 on:** July 27, 2017, 06:52:07 PM »

Totally 100% closed?

carlsoncvx18 · « **Reply #16 on:** July 27, 2017, 07:48:46 PM »

Ross mine has a big spring pulling everything closed.

Rosscoe · « **Reply #17 on:** July 27, 2017, 07:49:49 PM »

Mine too

Plugcheck · « **Reply #18 on:** July 27, 2017, 11:15:59 PM »

Springs are important, but the higher the tension, the more wear that occurs on the throttle bores. The choke linkage can vary quite a bit over different sub models, but I think that's were the issue is at. If the choke flap is wide open, but still at high idle, then check the linkage for contamination or binding. One thing to consider, there is normally a screw for setting high idle, and a screw on the opposite side to set idle speed. If the linkage is not against the idle speed screw, then something on the choke linkage side is amiss.

still_fishin · « **Reply #19 on:** July 28, 2017, 04:54:25 AM »

Do you have the return spring on the right side of the pivot? The spring I'm talking about is the one that brings your motor back to idle in the event that your throttle cable breaks. At one point while working on my intimidator I put mine in the wrong spot. Just a thought