Question about 1989 Oldsmobile Cutlass Ciera

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Even though the car only has 136k miles all the other cylinders compression is 200psi but the number 2 cyl compression is about 115psi which is out of specks it should be at lest 75% of the others

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Maybe maybe head gasket leaking.

Posted on Jun 26, 2009


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which engine? there are many.
can be 50 things
300 means random misfire on all cylinders.
it really means all cylinder have weak HP, weak power, weak combustion energy levels !

The ecu actually measures crankshaft acceleration rates (geekspeak)
in lay terms this means (btw 300s never lie, it's REAL misfire)
there is one exception a loose timing belt or cam chain. can trip 300s.

in no order ever.

1: bad spark to all cyl.
2: low compression to all cylinders (cam timing off, melted CAT)
3: bad fueling to all. (EGR stuck wide open , engine stalls?)

but can be 50 things, so its best not to GUE$$
what we do is conduct simple tests.
first is do the 60,000 mile tuneup. do that its cheap, and works in most cases.
1: tuneup time.sparks and filters both. fuel and air.
2: compression test, and vacuum tests. at WOT,. both. ask for data.
3: check cam timing. if compression fails on all cyl.
4: i scan the ECU looking at fuel trim and closed loop working, ask.

Jan 19, 2014 | Toyota RAV4 Cars & Trucks

2 Answers

2002 kia spectra misfire

bad senser or computer

Dec 11, 2013 | 2002 Kia Spectra

1 Answer

Cylinder #1 continues to Misfire

What DTC code(s) are you getting?
You performed a compression test on cylinder #1; did you test cylinder #2?
Compare the readings, if there is a significant difference in compression readings between the two, you may have a bad head gasket, a bad valve, etc.
The bottom line, the problem is internal to the engine.

Dec 09, 2013 | 2002 Buick LeSabre

1 Answer

What is the Compression supposed to be for a 1987 Toyota Pick up 22R with carb, 4 cyl.???

A new engine would be about 180 psi for each cylinder. As the miles add up and wear occurs, compression will get lower. The important thing is that compression is even and balanced-lowest compression reading should be within 75% of the highest cylinder's compression. Some Toyota engines had a minimum allowable compression of about 135 psi, but if compression is balanced, you could have average compression as low as 125 psi and engine would still run good, some loss of power but still acceptable, and oil consumption would not be that bad.
If cylinder compression is below 120 psi as an average, you should be looking into a rebuild event-rings and valves need attention. If any cylinder is below 100 psi, it may not even fire, certainly will produce no power, and could be a head gasket failure, very worn rings, or valve problems.
Remember the important thing is to find compression readings that are very close to each other. I have an '87 Sentra with 75,000 miles(true!)-lowest comp. is 160, highest is 165 psi-runs great, good power. Also a '79 Datsun pickup (with god only knows how many miles-about 200,000 maybe). Compression is about 125-135 psi, fairly well balanced-noticeable loss of power, very little oil burning, still runs fair to good-dependable, at least.
That should give you an idea of what to look for. Good luck.

Aug 29, 2013 | 1987 Toyota Pickup

1 Answer

No compression on number 2 cylinder

Start by pulling the valve cover off and watch the valves on cyl. 2, while the engine is cranking over. If you can see nothing amiss, the cylinder head will have to come off for further inspection. It coulod be a valve not sealing properly, so a head job is required.
How many miles on your '83? It's up to you how much you want to put in repairs on the car. If the engine is not burning oil, which could be worn piston rings on a high mileage engine, you might want to consider a cylinder head job, but that would depend on the compression readings for the rest of the cylinders. Personally, I like the older cars if still running good. My daily driver is a '79 datsun pickup....But there comes a point when repairs are more than the car's value permits.

Dec 18, 2012 | 1983 Oldsmobile Omega

1 Answer

2005 dodge caravan 3.3 no power

Hook up a scanner and run the engine. Put the scanner in data mode and look at throttle position, manifold pressure, fuel pressure, etc.

Oct 30, 2017 | Dodge Caravan Cars & Trucks

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Setting timming changed headgaskets timing marks up top set but bottom timming mark keeps movihg 15 deg btdc even know start at 5 deg rottor button set on number one but does not start . sounds like it is...

Put the engine at TDC compression stroke , Thats when the valves are both closed on No 1 cyl and the piston is on its compression stroke .then align all cam and crank marks. set distributor/rotor button on No 1 cylinder (rotor pointing at #1 plug wire) . rotate engine 2 revolutions and recheck all marks. Fire away

Aug 25, 2009 | Mitsubishi Passenger Cars & Trucks

1 Answer

Two front cylinders are low

If your going to chg. head gasget, as long as you got the head off you would be smart to have a valve job done too. That could be why you lost compression in the 2 cyls. burnt valves will cause loss of compression. But take note if you elect to have a valve job done you also run the risk of it to start useing oil because of the increase in compression on the oil rings with that many miles it can happen.

Mar 19, 2009 | 1991 Jeep Wrangler

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