1.7L running rough in the mid RPMs, Potential Causes of rough running (MIDS) |
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1.7L running rough in the mid RPMs, Potential Causes of rough running (MIDS) |
scwade |
Oct 12 2003, 08:43 PM
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#1
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Newbie Group: Members Posts: 10 Joined: 31-August 03 From: santa clara, ca Member No.: 1,091 |
I have a 1971 1.7L (with big bore kit) running FI. I'm having some odd behavior between 4,000-4,300 RPM. It runs rough at that RPM regardless of gears/speed.
I've checked timing at 3,500 (fine). I've swapped spark plugs (bosh) // got rid of some pre-detination ping, but still have the roughness (cutting out) I've put in 91 octane (best I can get here in CA) Still happens. PS - it idles rough as well. When I remove the "retardation" line it idles fine. I've not tried to run it full boar with no retardation though. Any ideas? Scott |
scwade |
Oct 21 2003, 10:49 PM
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#2
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Newbie Group: Members Posts: 10 Joined: 31-August 03 From: santa clara, ca Member No.: 1,091 |
It runs fine all the way up to ~4000 rmp, then bucks through to about 4300, then seems to run fine again. No backfires at all, there was some ping, but the new plugs cleared that up (of course they may not be hot enough...Not sure yet).
I ordred the distributor as suggested, so I'll drop that in when it arrives, then see if I need to adust fuel pressure or the MPS. Not sure how to do those, but I suspect I might find suggestions on the Pelican parts site. Thanks again and I'll be back afther the part arrives. Cheers, Scott |
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