Ignition problems

Buick Regal, Century and Park Avenue as well as the Rendezvous and Lesabre.
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Jethro280

Ignition problems

Unread post by Jethro280 » Mon Jun 15, 2020 4:23 pm

95 buick dies occasionally under deceleration, starts right up. Tried crank sensor icm and coils. Strange thing is at battery i have 14 volts on scantool i only show 12.2-12.6 volts

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carriedi
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Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: Ignition problems

Unread post by carriedi » Thu Jun 18, 2020 7:32 am

a common cause for dies on decel is a dirty throttle body. The sides of the throttle plate build up deposits in the throttle body abd when you let off the gas you don't have the minimum air flow to keep the engine running before the IAC can adjust for it. Clean the throttle body and see if that takes care of the problem.

As for the voltage reading, you should verify the readings. It is possible that the computer may have a different voltage from battery voltage from bad connections somewhere between the battery and the computer. Corrosion in a connector of at a ground bolt can cause resistance dropping the voltage. So, check for good power and grounds at the ECM

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