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#1 |
Senior Member
Join Date: May 2010
Posts: 219
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Can an engine backfire blow out a modulator so the transmission doesn't shift properly on a '68 Ford C4 transmission?
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#2 |
Senior Member
Join Date: May 2010
Location: Midland Park, NJ
Posts: 4,018
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Check your vacuum connections - the C4 will not shift without vacuum
I doubt that an engine backfire will knock out a modulator, but replace it if its got a lot of miles and years on it.
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#3 |
Senior Member
Join Date: Sep 2014
Posts: 160
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Easy way to tell if the modulator is blown, pull the vacuum hose off of it, if oil drips out its blown.
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#4 |
Senior Member
Join Date: May 2010
Posts: 219
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Thank You for your replies.
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#5 |
Senior Member
Join Date: Jan 2015
Location: Birmingham, Al.
Posts: 339
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Could have blown the hose off =]
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#6 |
Senior Member
Join Date: Nov 2011
Location: Silver Creek GA
Posts: 100
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#7 |
Senior Member
Join Date: May 2010
Location: Palmer, Alaska
Posts: 1,576
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you might try adjusting the bands, it may help things a bit.
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#8 |
Senior Member
Join Date: May 2010
Posts: 219
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Thank You for your replies, I appreciate your help.
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#9 |
Senior Member
Join Date: May 2010
Posts: 219
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I was finally able to get under the car yesterday, I found the hose going to the modulator dry rotted and cracked. I replaced it and the transmission shifts well. Thanks to all who offered help.
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#10 |
Senior Member
Join Date: Aug 2012
Location: Abq, NM
Posts: 3,626
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If any of the rubber fuel lines are even close to the same age, replace them too.
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