idles fine but sputters when driving

bgs26 · Jun 28, 2008

I started out today needing to adjust the timing on my '66 170 i6. Seems simple right...wrong. As I was removing the vacuum line off of the distributor, it broke. OK simple, I will fix it after I set the timing. Well after finally getting a good idle, I went all over God's creation looking for a new vacuum line. After finally finding that, I installed everything as it was and went for a test drive. I did not get far. At idle everything seems fine. When I give a little throttle the motor sputters and kind of backfires. Any suggestions?

broncnaz · Jun 28, 2008

intake or exhuast back fire? either way you may have to much or to little timing. Did you adjust the points?

oleguy74 · Jun 28, 2008

ck.timming again.

bgs26 · Jun 28, 2008

did not adjust the points

broncnaz · Jun 28, 2008

I'd check the point gap and adjust as needed then reset the timing. If the points are worn or need adjustment timing will be hard to adjust.

fireman1749 · Jun 28, 2008

check the seal between the carb and the intake.....

bgs26 · Jul 2, 2008

seal between carb and intake are good. checked timing again and it is good. idles fine at about 500 rpm. starts to sputter at about 1500 rpm. could my problem be the vacuum advance on the distributor?

bgs26 · Jul 2, 2008

can i just use a regular voltage meter to check the points?

Viperwolf1 · Jul 2, 2008

No you need either a dwell meter or a feeler gauge.

75bronco08 · Jul 2, 2008

did it do it before you set the timing?if so i would say timing and check vacuum advance.

bgs26 · Jul 2, 2008

it did not do it before i set the timing. when i went to remove the vacuum advance line from the distributor it broke. now i have a different vacuum line and it may not be pulling vacuum. that is why i asked if that could be the problem.

75bronco08 · Jul 2, 2008

yes it could cause what your decribing.

Viperwolf1 · Jul 2, 2008

Timing will change as the points and rubbing block wear. You corrected the timing change but did not correct the dwell or point gap. Always set dwell or gap first before timing because dwell affects timing. Timing does not affect dwell.

Dr. Bronc · Jul 2, 2008

Sorry to hijack the thread. But what is the point gap for the 170 motor? I'm in the process of timing too.

Viperwolf1 · Jul 2, 2008

0.027" for 68-74
0.025" for 66-67

bgs26 · Jul 3, 2008

what about the dwell for the '66? what is the setting?

Viperwolf1 · Jul 3, 2008

40 degrees 66-67
37 degrees 68-74

bgs26 · Jul 3, 2008

update:
I acquired a dwell meter and found that the setting was way off. It was like 23-25. I adjusted the dwell which then threw the timing off again. I adjusted the timing and it idles way better than it did before. It is pretty smooth. Also, the sputtering when driving has stopped. I took it for about a 30 min. drive and everything seemed fine. It still has a little exhaust backfire but that could be caused by another problem. I need to change out the gaskets on the engine, but that is a whole other project. Thanks to everyone who had some input. It is greatly appreciated.

75bronco08 · Jul 3, 2008

cool,glad you got it going.

idles fine but sputters when driving

bgs26

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broncnaz

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oleguy74

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bgs26

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broncnaz

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fireman1749

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bgs26

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bgs26

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75bronco08

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bgs26

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Dr. Bronc

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