Starts out smooth, then what the buck? |
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Starts out smooth, then what the buck? |
Jesco Reient |
Dec 18 2013, 06:24 PM
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#1
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Member Group: Members Posts: 135 Joined: 18-July 12 From: Western Washington Member No.: 14,690 Region Association: Pacific Northwest |
When I first start the car cold for the day. (2056, D-jet, Raby 9590 cam, timing 27 advance @3500) The car has no cold start valve but has not seemed to care. First start it runs smoothly pulls away from the house shifting @ 3500 it acts nicely. After warming up for awhile as the motor reaches 3200 to 3600 it bucks severely then above 3600 it smooths out a bit. Then as it gets warmer the bucking moves down the RPM range to 2600 to 2800 RPM becoming not very drivable. any ideas out there? (IMG:style_emoticons/default/confused24.gif)
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r_towle |
Dec 19 2013, 09:40 PM
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#2
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Custom Member Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Runs good cold, run worse when hot.
Metal expands when heated. Check our valves. |
rick 918-S |
Dec 19 2013, 10:28 PM
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#3
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Hey nice rack! -Celette Group: Members Posts: 20,503 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
Runs good cold, run worse when hot. Metal expands when heated. Check our valves. I would agree it is always good to check valves I would think it would be less likely that it would cause a specific RPM range miss or bucking. Fuel delivery or.... (IMG:style_emoticons/default/idea.gif) MAPS is starting to crack. |
Jesco Reient |
Dec 20 2013, 08:41 AM
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#4
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Member Group: Members Posts: 135 Joined: 18-July 12 From: Western Washington Member No.: 14,690 Region Association: Pacific Northwest |
Runs good cold, run worse when hot. Metal expands when heated. Check our valves. .... (IMG:style_emoticons/default/idea.gif) MAPS is starting to crack. I'm in denial on checking that also but might as well, otherwise I'm just lying to myself. The somewhat progressive nature of this has had me thinking about that diaphragm in the back of my head. |
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