Problem solved. Engine speeding up between shifts, Must be something with the cabs (but what?) |
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Problem solved. Engine speeding up between shifts, Must be something with the cabs (but what?) |
HansJan |
Nov 12 2020, 10:11 PM
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#1
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Member Group: Members Posts: 395 Joined: 5-April 16 From: Sugar Land TX Member No.: 19,860 Region Association: Southwest Region |
Hello,
Besides the occasional backfire (mostly on decel) the car runs great. It seems that I have to reset the idlespeed on my car each spring and each fall. Which is totally acceptable. But within the last week it developed a condition where the engine speeds-up between gear shifts. Its almost like Im keeping the accelerator down. When coming to a full stop, it takes about 3 seconds before it falls down to idlespeed. It has Dual EMPI Carbs. What could cause this? |
JRust |
Nov 12 2020, 10:24 PM
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#2
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914 Guru Group: Members Posts: 6,305 Joined: 10-January 03 From: Corvallis Oregon Member No.: 129 Region Association: Pacific Northwest |
Your accelerator cable is wrapped around your clutch cable
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ndfrigi |
Nov 12 2020, 11:03 PM
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#3
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Advanced Member Group: Members Posts: 2,928 Joined: 21-August 11 From: Orange County Member No.: 13,474 Region Association: Southern California |
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bandjoey |
Nov 12 2020, 11:13 PM
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#4
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bandjoey Group: Members Posts: 4,925 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
My Dells did the same thing after about 3k from overhaul. Put some silicone lube on the bellcrank's and on the linkage and it's back to normal. Hope that helps,
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bdstone914 |
Nov 13 2020, 08:54 AM
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#5
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bdstone914 Group: Members Posts: 4,517 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
I agree with the above possible causes. Disconnect the cable at the carbs to see if the carb linkage or the cable is the problem. If the cabkes are crossed the clutch cable will drag against the accelerator cable. Remove the cover at the front of the tunnel as use a mirror and light to look inside.
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rhodyguy |
Nov 13 2020, 09:44 AM
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#6
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,075 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
Are you using an additional spring on the linkage or relying on the springs on the carb shafts?
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HansJan |
Nov 13 2020, 11:58 AM
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#7
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Member Group: Members Posts: 395 Joined: 5-April 16 From: Sugar Land TX Member No.: 19,860 Region Association: Southwest Region |
Are you using an additional spring on the linkage or relying on the springs on the carb shafts? There is an additional spring between the Hexbar and engine bay. When operated by hand (turn hexbar directly) it snaps back without delay or drag, but still has the 3 second delay in returning back to idle-speed. |
type2man |
Nov 13 2020, 05:00 PM
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#8
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Member Group: Members Posts: 353 Joined: 3-March 09 From: Miami, Fl Member No.: 10,127 Region Association: South East States |
Intake leak
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HansJan |
Nov 13 2020, 05:51 PM
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#9
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Member Group: Members Posts: 395 Joined: 5-April 16 From: Sugar Land TX Member No.: 19,860 Region Association: Southwest Region |
The bracket that holds the outer sleeve of the accelerator cable had shifted, which caused the cable to bind. Problem solved.
Thanks to all that chimed in. |
porschetub |
Nov 13 2020, 06:31 PM
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#10
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Advanced Member Group: Members Posts: 4,697 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Intake leak (IMG:style_emoticons/default/agree.gif) well said,a slow drop to idle is generally that issue,FI is worse but carbs will suffer "false air" issues also been there. Common area's is that folks overtighten manifold to head bolts and they happly pull out if the head,oh and don't use the crap thick gaskets supply by the likes of EMPI for there less than great manifolds. Has the OP rebuilt his pedal assembly,is the throttle sticking @ this point or a bad cable...who knows. |
ndfrigi |
Nov 13 2020, 07:54 PM
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#11
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Advanced Member Group: Members Posts: 2,928 Joined: 21-August 11 From: Orange County Member No.: 13,474 Region Association: Southern California |
can you share how you solved it? thank you!
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HansJan |
Nov 13 2020, 10:44 PM
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#12
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Member Group: Members Posts: 395 Joined: 5-April 16 From: Sugar Land TX Member No.: 19,860 Region Association: Southwest Region |
can you share how you solved it? thank you! See picture. The bracket (red arrow) had moved a little. This caused the cable to bind. I repositioned it back to we’re it belongs and tightened the bolt (yellow arrow). Reset the idle speed to as low as possible (approx 900 rpm). And Whalla.... Problem solved. |
ndfrigi |
Nov 14 2020, 01:08 AM
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#13
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Advanced Member Group: Members Posts: 2,928 Joined: 21-August 11 From: Orange County Member No.: 13,474 Region Association: Southern California |
can you share how you solved it? thank you! See picture. The bracket (red arrow) had moved a little. This caused the cable to bind. I repositioned it back to we’re it belongs and tightened the bolt (yellow arrow). Reset the idle speed to as low as possible (approx 900 rpm). And Whalla.... Problem solved. Thank you! This thread will help some members too. Sometimes we try to find various fixes but ended up just a small issue. |
porschetub |
Nov 14 2020, 02:58 PM
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#14
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Advanced Member Group: Members Posts: 4,697 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
can you share how you solved it? thank you! See picture. The bracket (red arrow) had moved a little. This caused the cable to bind. I repositioned it back to we’re it belongs and tightened the bolt (yellow arrow). Reset the idle speed to as low as possible (approx 900 rpm). And Whalla.... Problem solved. Thank you! This thread will help some members too. Sometimes we try to find various fixes but ended up just a small issue. Excellent result and easy,well done (IMG:style_emoticons/default/smilie_pokal.gif) . |
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