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Surging under load after jumpstarting

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Old Sep 28th, 2017, 14:53   #1
salty
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Question Surging under load after jumpstarting

I'm a new Volvo owner, just picked up a '73 145 w/ the fuel injected B20 engine. It drove smoothly when purchased, and within a few days I left it parked with the lights on, and drained the battery. Gave it a jumpstart, and since then it surges badly when under a load. Anyone have experience with similar issues (surging or problems after jumpstarting)?

It starts and idles fine, the surging only happens when in gear and driving. It surges in various timing patterns, 3 times per second, or in pairs of two quick surges followed by a short pause and repeats, etc. If you floor it, the surge is less noticeable, and as the rev's rise towards 4000 it reduces, but doesn't' entirely go away.

While cruising, it feels like when a driver is quickly cycling the accelerator.

Perhaps the control unit or fuel injectors were damaged...anyone here know the process to check these old fuel injectors?

It could be coincidental with the jumpstart...could something else have happened?
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Old Oct 4th, 2017, 15:07   #2
salty
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I have an update on this problem. The following day, the car ran as it had before the jumpstart, without any changes.

The next day, I discovered that the positive battery terminal was loose. I have replaced that battery clamp, cleaned the terminals, and re-tightened the battery cables, and the ground to the block. I haven't experienced this problem again since the day I posted this.

I don't know if it was something else which resolved itself, perhaps the ECU was rebuilding it's fuel trim tables, perhaps the loose battery connection was causing some voltage variability that was affecting the injectors...hoping it doesn't return!
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Old Oct 5th, 2017, 11:09   #3
Billy Smalls
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Well done Salty - sorry no one got back to you. I run a bog standard carb 144 so wasn't able to help.

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Old Oct 5th, 2017, 15:47   #4
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Thanks Billy. I'm thinking about building a megasquirt FI system. It would allow data logging, which should help debugging this type of stuff. With that system I could setup fuel map tables to richen the mixture when the throttle is wide open (I think this is done through the MAP sensor, I dont' think it requires a TPS).

I still have an idle that sticks high around 1600, and even after I blip the gas to get it to drop down, it only gets down to about 1100 or 1200. I'd like to get that figured out soon to increase my gas mileage.
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Old Oct 29th, 2017, 13:36   #5
Derek UK
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Clean throttle body and check ALL intake related rubber hoses for leaks. Remove one at a time and inspect carefully. Replace any that are suspect.
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