 Idle adjustment screw for D jet, How many turns before idle should change? |
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| jsaum |
 Jun 21 2011, 10:09 AM
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Senior Member  Group: Members Posts: 530 Joined: 12-June 07 From: Everett, WA Member No.: 7,809 Region Association: None  |
I was helping Matteyp tune his car last night and it's the first time I have worked on a fuel injected engine. We got the dwell set and the engine timed with the light, it's running better but when I tried to adjust the idle speed the adjustment screw didn't seem to affect the idle speed I gave it two full turns in each directions. My questions is how sensitive should this adjustment be?
Jsaum |
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| r_towle |
Jun 22 2011, 10:21 AM
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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 
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48-52 is the dwell range....48 is the sweet spot.
52 is the acceptable tolerance, so shoot for 48 As the points get corroded the dwell increases because the gap actually gets smaller as the corrosion builds up over time. Do look at the vacuum canister and try to set the idle with the hoses removed from the distributor and hoses plugged. When I look for a vacuum leak I remove all hoses from the plenum except the MPS. I cap all the hoses at the plenum with either rubber vacuum caps , or electrical tape. I remove ALL systems. Then set the idle. After that...add ONE line at a time and retest. You may find that your AARis leaking, the decel valve is leaking etc etc.... Rich |
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| Cap'n Krusty |
Jun 22 2011, 07:49 PM
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(r_towle @ Jun 22 2011, 09:21 AM)  48-52 is the dwell range....48 is the sweet spot. 52 is the acceptable tolerance, so shoot for 48 As the points get corroded the dwell increases because the gap actually gets smaller as the corrosion builds up over time. Do look at the vacuum canister and try to set the idle with the hoses removed from the distributor and hoses plugged. When I look for a vacuum leak I remove all hoses from the plenum except the MPS. I cap all the hoses at the plenum with either rubber vacuum caps , or electrical tape. I remove ALL systems. Then set the idle. After that...add ONE line at a time and retest. You may find that your AARis leaking, the decel valve is leaking etc etc.... Rich Actually, the dwell spec is 47 +/- 3 degrees. 52 is far too high, meaning the point gap would be too small. Setting them that way means they'll close up even more, and your dwell might end up around 60. The Cap'n |
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Posts in this topic
jsaum Idle adjustment screw for D jet Jun 21 2011, 10:09 AM
r_towle its an air bypass screw and its sensitive.
If it d... Jun 21 2011, 10:13 AM matteyp James did we have that vacuum line plugged when yo... Jun 21 2011, 10:51 AM
jsaum
James did we have that vacuum line plugged when y... Jun 21 2011, 11:10 AM windforfun It's very sensitive. Jun 21 2011, 11:12 AM r_towle what did you set the dwell to?
How did you set the... Jun 21 2011, 11:14 AM jsaum
what did you set the dwell to?
How did you set th... Jun 22 2011, 09:20 AM Ian Stott I adjusted my idle up last weekend, did it when th... Jun 21 2011, 11:59 AM Drums66 ......vacuum leak?.....it is sensative! :idea:... Jun 21 2011, 11:59 AM Prospectfarms
It's very sensitive.
what did you set the... Jun 21 2011, 03:18 PM 76-914 Also, with the breather off you should be able to ... Jun 21 2011, 08:46 PM 76-914
48-52 is the dwell range....48 is the sweet spot.... Jun 22 2011, 10:34 PM 70-914nut 1.7 liter 3500 rpm@ 27 deg BTDC Jun 22 2011, 06:00 PM r_towle Its like me and my shadow.
So happy you get up eac... Jun 22 2011, 08:01 PM |
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