 surging after warm-up |
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| stecz |
 Sep 12 2005, 06:26 AM
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#1
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Member  Group: Members Posts: 61 Joined: 20-February 04 From: Cedar Park, TX Member No.: 1,688  |
My '73 2.0 (stock FI) is having a problem... Before it warms up completely, it runs very strong and smooth, but after warm-up (oil temps over 180 degrees), it tends to surge and the motor just feels "flat", not the power it usually has. The valves are adjusted to spec. Has anyone else seen this? Do I look toward ignition or fuel?
It never feels like it's going to stall, and it idles fine... The only non-stock part of the FI is that the cold start injector is disabled. (It was leaking). |
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| solex |
Sep 12 2005, 06:51 AM
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#2
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Senior Member Group: Members Posts: 789 Joined: 12-January 05 From: Long Island, NY Member No.: 3,439 Region Association: North East States |
Does it seem if the idle is hunting? I had an idle hunting problem when warm it turned out that the PO had too much advance. I found TDC and mark the fan and timed it appropriately and the hunting dissappeared.
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| Bleyseng |
Sep 12 2005, 07:00 AM
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#3
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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 |
What MPS are you running? Have you tested it with a vac pump?
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| 914efi |
Sep 12 2005, 07:11 AM
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#4
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Member Group: Members Posts: 140 Joined: 14-June 04 From: Westport,MA Member No.: 2,204 Region Association: None |
Check for vacuum leaks. Whatever richness present during warm up could be masking a lean condition when fully warm due to vac leaks.
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| stecz |
Sep 13 2005, 08:58 PM
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#5
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Member Group: Members Posts: 61 Joined: 20-February 04 From: Cedar Park, TX Member No.: 1,688 |
What's the correct way to make the mixture richer? Up the fuel pressure?
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| markb |
Sep 13 2005, 09:31 PM
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#6
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914less :( Group: Members Posts: 5,449 Joined: 22-January 03 From: Nipomo, CA Member No.: 180 Region Association: Central California 
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Worn out TPS?
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| bd1308 |
Sep 13 2005, 09:50 PM
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#7
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
fix the vac leaks.... |
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| Stieve |
Aug 2 2006, 11:53 PM
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#8
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Senior Member Group: Members Posts: 587 Joined: 6-May 06 From: Sacramento Member No.: 5,996 |
My 73 1.7 does a simular thing and at 3000 to 3500 it surges, It has Pertronix pick up and a New Pertronix coil put in today.
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| Rand |
Aug 3 2006, 12:03 AM
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#9
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
How's the dwell?
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| Stieve |
Aug 3 2006, 12:12 AM
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#10
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Senior Member Group: Members Posts: 587 Joined: 6-May 06 From: Sacramento Member No.: 5,996 |
Mine is electronic
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| Rand |
Aug 3 2006, 12:21 AM
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#11
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Hey Stieve. About dwell, I was addressing the orignal poster.
In your case, how do the tracks in the TPS look? |
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| Stieve |
Aug 3 2006, 12:33 AM
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#12
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Senior Member Group: Members Posts: 587 Joined: 6-May 06 From: Sacramento Member No.: 5,996 |
QUOTE(Rand @ Aug 2 2006, 11:21 PM)  Hey Stieve. About dwell, I was addressing the orignal poster. In your case, how do the tracks in the TPS look? Don't know...what tracks? Unclear as to what I am looking for. Throttle Position switch on the throttlebody... |
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