Question about 1990 Oldsmobile Cutlass Ciera

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1990 olds cearia 2.5

When accelerating motor backfires thru TBI ? help . Idles smooth .

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Hello;
Most likely cause is a broken valve spring on one of the intake valves. Seat pressure is light enough to idle smooth but on acceleration the dynamics increase the pressures and the spring can not keep up. Hangs the valve open breifly and you get a backfire through the TBI.
Hope this helps.
Thanks;
Rich
RPM Northwest

Posted on Jan 22, 2009

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the 90 has no CARB, the 89 1.3l ONLY did
but the 1.6L are all EFI , TBI throttle body systems.
If infact it does have a carb, someone added it, it's not stock.

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the 90 has a stand alone distributor, the ECU does not make
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So you have backfiring , back up thru the throttle body to the air cleaner. this is a clear sign of never doing the tuneups.
The service manual is free as id the op. guide..
The 60k, mile tune (service points in today lingo) was skipped
am I right/
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2: and spark timing way off (last step in tuneup finds this)
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The compression WOT, must be 150 PSI.
not 100.
here is the 60k, see this?
http://www.fixkick.com/specs/scheduleBw.jpg

here is the compression test.
http://www.fixkick.com/compressiontest.html

did you ever set the crank bolt (front)
to the new TSB (circa 96 , and retrograde) spec?
here
http://www.fixkick.com/All-Pdfs/TSB/89-96crank-bolt.pdf

then a full spark tuneup
then check spark timing, and if way off consider the
cam has slipped?
see 8v section here.
http://www.fixkick.com/t-belt/tbelt-index.html#Tbelt-main

here is the motor and CARB id page. stock only.

http://www.fixkick.com/find-parts.html


you have enough now to wet the whistle. goodluck

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----------High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
------------Engine Backfires? http://technoanswers.blogspot.in/2012/02/jeep-backfires.html----------- Nissan stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

-----------
Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm? http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
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