 What's going on, 4500 rpm breakup |
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| Teknon |
 Oct 3 2004, 09:06 AM
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#1
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The more I learn the dumber i think I am  Group: Members Posts: 357 Joined: 10-August 04 From: Denver, Colorado Member No.: 2,505 Region Association: Rocky Mountains  |
Finally got my car started. But it breaks up and sputters hard at 4500 rpm and hesitates badly on accelleration. Is there any test I can do to isolate the problem. So I can fix what's wrong. It is still a blast to drive with the problem. (IMG:style_emoticons/default/driving.gif)
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Replies(1 - 8)
| Bleyseng |
Oct 3 2004, 09:12 AM
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#2
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Aircooled Baby! Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Check the timing..
Change the fuel filter Is it running rich? adjust the valves.. New points,cap,plug wires Ton of stuff to look at.. Geoff |
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| SLITS |
Oct 3 2004, 10:05 AM
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#3
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
FI or Carbs?
Points or electronic? Age of engine? Need some info to guess. |
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| Teknon |
Oct 3 2004, 10:21 AM
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#4
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The more I learn the dumber i think I am Group: Members Posts: 357 Joined: 10-August 04 From: Denver, Colorado Member No.: 2,505 Region Association: Rocky Mountains |
1970 1.7 d-jetronic with electronic distributor
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| nebreitling |
Oct 3 2004, 12:07 PM
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#5
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Member Emeritus Group: Members Posts: 3,314 Joined: 26-March 03 From: San Francisco Member No.: 478 |
i suspect ignition before FI in cases where you have a specific "hole" in acceleration.
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| airsix |
Oct 3 2004, 12:21 PM
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#6
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I have bees in my epiglotis Group: Members Posts: 2,196 Joined: 7-February 03 From: Kennewick Man (E. WA State) Member No.: 266 |
Adjust the point dwell and then set the timing. Lightly lube the leading edge of the phenolic (sp?) cam follower (on the points). Can't promise this is the problem, but symptoms sound right for points that are barely opening.
-Ben M. |
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| SLITS |
Oct 3 2004, 11:26 PM
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#7
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
Since you have electronic ignition, the dwell angle is not a factor unless the module is breaking down.
1. Age of spark plugs wires - if they are old they can cross fire with each other and/or to ground. 2. Check for high tension tracking inside the cap (black tracks running down the side or between poles. 3. I assume you do not have a rev limiting rotor - if you do, change it. 4. Spark plugs - new or ?. What type. 5. Bad tracks in Throttle Position Sensor 6. Dirty or defective trigger points. 7. Mal adjusted valves or weak valve springs. Just a few guesses................... |
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| Tab914 |
Oct 4 2004, 12:37 AM
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#8
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Member Group: Members Posts: 158 Joined: 25-April 04 From: Alexandria, Ontario, Canada Member No.: 1,978 Region Association: Canada |
I agree with Slits. Had the same problem and it was due to bad tracks in the throttle switch. Just check everything else to make sure the rest is set where it should be.
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| Teknon |
Oct 4 2004, 07:35 AM
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#9
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The more I learn the dumber i think I am Group: Members Posts: 357 Joined: 10-August 04 From: Denver, Colorado Member No.: 2,505 Region Association: Rocky Mountains |
Thanks fellow 914ers. I will start my trek to the electical system. Thanks for the heads up. Joe (IMG:style_emoticons/default/agree.gif)
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