Question about 1996 Pontiac Sunfire

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1996pontiac sunfire2.4motor no compression number 2 cylnder

No compression in number 2 cylnder could it be a valve problem

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More than likely is a burnt./bent valve. I would remove the head as sometimes the seat insert becomes loose and results in head work to fix. No compression can also mean broken rings or scored bore so the head will have to come off to determine exactly what happened .

Posted on Jul 22, 2013


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Posted on Jan 02, 2017


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How i do timing without using marks but using positions of camshaft wen cranksshaft is on TDC on cylnder 1..

The short answer is you can't. When #1 is at TDC on the compression stroke, both valves are closed. But unless you know the valve opening and closing specifications, and have a way to measure how many degrees each valve is in its rotation (and knowing that the camshaft only turns half as fast as the crankshaft), you will have a very difficult time determining exactly which tooth of the camshaft to hang the timing belt/chain on. Do it right - pull off the timing cover and visually line up all the marks.

Apr 05, 2017 | Cars & Trucks

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Hi I'm getting low compression pressure on cylinder 2 on my Renault Clio 1.4 16v 2003 model 1,3&4 are OK I have changed head gasket,valves,rings but still the compression is low can anyone help please

I wonder did you check your work as you progressed?
Pressure testing the valve seats for instance or even just a paraffin test? A good valve seat is difficult to obtain with the hardened steel seats used for unleaded fuel, especially when using a coarse grade of carborundum paste.

In order to discover where the compression leak is it will be necessary to set the cylinder at the top of the compression stroke, lock the engine and then inject compressed air into the cylinder using either a propriety or home-made adapter in the spark plug hole. It will soon be obvious where the air is leaking from indicating the fault.

Valve clearances are important and in the case of hydraulic self-adjusting valve lifters it is possible for them to stick and hold the valve slightly open. I generally squeeze each one in a vice several times until all the oil has been evacuated.
If the valve spring is weak or the oil pressure relief valve is stuck closed tappet jacking is possible.
Good luck!

Nov 02, 2015 | Renault Cars & Trucks

1 Answer

Low compression on number 2 cylinder

if you have low compression on just one cylinder the possibilities are
burnt valve
bent valve
loose seat insert
broken ring
scored bore
valve adjustment

Feb 24, 2015 | Cars & Trucks

1 Answer

1996 pontiac sunfire 2.4 motor low compression number 2 cylnder

Very possible
A cylinder leak down test would
be better to pin point, that then compression test
Go to You Tube Video to understand cyl leak down

Jul 22, 2013 | Cars & Trucks

3 Answers

2000 civic ex, three years ago previous owner had burnt valve on number 3 cylinder- garage sent head to machine shop and repaired. Now for me and only about 7,000 miles later it occurring again. Burnt...

When the compression is good or within specs. You don't have a burnt valve. A bad valve will cause low to no compression at all. The misfire could have been from the spark plug, fuel injector, or coil. You said the check engine light was on. do you remember the code/s?

Feb 05, 2011 | 2000 Honda Civic

1 Answer

1999 kia sephia cranks over but wont start, sputters like it wants to now and again and in between sputtering it spins fast without that "thump" of compression it normal has. replaced fuel pump and fuel...

check your timing belt put no 1 cylnder at top dead center timing mark at 0 remove your distrebuter cap and see if the rotor is pointing at number 1 spark plug
if not replace that belt (replacement is at 60k I believe) sounds like the fix good luck CJ ps no. one on compression stroke

May 12, 2010 | 1999 Kia Sephia

1 Answer

I have a Renault Megane 1.4 2000 model the timing belt has not snapped but the teeth on the belt have broken away which in turn will not allow the timing belt to rotate. Would this be just as bad as the...

Yes it is as bad as the belt snapping, if your lucky there will be cutaways in the pistons so the valves may not have touched, its a bit tricky to check until you replace the belt and can check valve clearances and cylnder compressions,
or remove the head and check.
If you replace the belt it is often recommented to replace any bearings and pulleys as well, as a tight bearing may be the initial cause.

Apr 25, 2010 | 1986 Renault Sport

1 Answer

How to adjust the valve adjustments

you need to remove the valve cover and if they are even adjustable there will be locknuts on a stud on one side you need feeler gauges and adjust by loosenin the nut with cylinder in compression sequence tightrn stud with screw driver or allen wrench whichever applies put feeler guage probably.018 between rocker and vale tightrn untilfeeler gauges move with some resistance lock nut tight but be sure you can still move feeler gauge get all cylnders then reinstall valve cover

Jul 21, 2009 | 1992 Daihatsu Rocky

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