74 914 2.0 dJet slight hesitation |
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74 914 2.0 dJet slight hesitation |
nsargeant |
Mar 12 2020, 07:38 AM
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#1
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Newbie Group: Members Posts: 12 Joined: 27-August 17 From: Vincennes, In Member No.: 21,381 Region Association: Upper MidWest |
In the quest for a perfect running 914 im getting oh so close. In the past I have replaced the tps with a new one that fixed the severe bucking/hesitation. The car ran so much better after that. What I am trying to figure out now is a random hesitation/hiccup that happens mostly during steady throttle when I am cruising on a highway. If I drive 30 miles it might happen once or twice. It seems pretty minor compared to the bucking I was having with the old tps. If I recall it has had this hesitation since I have owned the car for the last 3 years. I know the distributor does have a pertronix module in it. Ive recently changed replaced a few things listed below but still have that little hiccup. What would you guys investigate next?
Replaced: Fuel pump/filter Installed SS lines plugs, wires, rotor, (cap still looked new) tps sensor |
Bleyseng |
Mar 12 2020, 08:28 AM
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#2
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Aircooled Baby! Group: Members Posts: 13,036 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Two things to try:
1. Pull the dizzy apart and clean clean the advance weights deep inside to rid them of 50 yr old grease and the clean the advance plate. 2. Hook up a LM2 O2 setup and drive on the freeway at the speed this problem occurs. What is the AFR reading when this happens? My bet is the MPS is running at 15 to ! for your AFR and this is a Leaning out problem. Adjust the MPS to 13.7 to 1 at this "part load" operation. Reset the WOT to start at 11 to 1 . |
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