Jump to content

compression test, is it right?

Deer hunter

Recommended Posts

More use on my problems with my 3.9 that has been stood for 2 years.

Was missing a little, and puffing fumes out of the exhause like mad.

ECU changed, air byepass valve ,colant and fuel tempm sensors changed.

Then n otices that the oil is half way up the dip stick>

Well smells more like petrol.

There is no froth in collant, no crankcase compressio.

So out with the injector, tested none leaking??

Compression test show all cylinders but 1 at around 190 - 200 , 1 at 165.

Is that enough to cause a probleM

I did put in some expensive fuel additive that I was told would clear thge injectors, I did this nprior to testing them.

How long would it continue to smoke if the problem has been cured?

Any ideas on what I should do next please ?

Link to comment
Share on other sites

For the injector stuff cleaner to work the engine has to be running - then the petrol and cleaner does its trick - over time.

How did you test the Injectors ?

The best way is to have them ultrasonically cleaned and tested,

A cheap way is to take the whole of the fuel rail off leaving injectors connected to rail, turn upside down switch on - none should leak, remove Coil to Dizzy lead so it won't try to run - then turn key and see if they squirt and then when you stop cranking do they equally stop squirting ?

This WILL spray fuel around at HIGH Pressure so be very carefull !

Fuel Pressure test is the other thing you need to do, also check each injector with a multimeter to chaeck reading - see the test manual I ahve shoved in the tech forum


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We use cookies to ensure you get the best experience. By using our website you agree to our Cookie Policy