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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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.
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.

the 89 to 95 TBI cars are near the same, 1.6L 8valves.
the 90 has a stand alone distributor, the ECU does not make
or regulate spark like a 91 does.

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/
this skipped point allows the timing belt to slip.
the first sign of that is.
1: low compression.
2: and spark timing way off (last step in tuneup finds this)
3: backfiring, due to gross cam timing and dizzy timing errors.

The compression WOT, must be 150 PSI.
not 100.
here is the 60k, see this?

here is the compression test.

did you ever set the crank bolt (front)
to the new TSB (circa 96 , and retrograde) spec?

then a full spark tuneup
then check spark timing, and if way off consider the
cam has slipped?
see 8v section here.

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

you have enough now to wet the whistle. goodluck

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you can take it to a muffler shop and they can test the pressure in your cat. converters for cheap or free. that will tell you if they are wrecked or not.

i would get it checked out asap because if your cats are the problem they well break your o2 sensors for the cats.

if you need to fix them you can do it cheeply by drilling holes in the cats to let the air out.

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Check the list may help

Engine misfires periodically =

Ignition coil layer shorted > Replace
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Spark plug(s) insulator nose leaking > Replace
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