2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
Wait a minute. Are you trying to do a compression test or a leak down test? Two very different tests.So, if I want to hook my air to the cylinder, it wont work at BDC on either stroke?
========================Wait a minute. Are you trying to do a compression test or a leak down test? Two very different tests.
When doing a compression test, you remove ALL 8 plugs and screw the tester into one cylinder at a time. Then crank the motor over 3, 4 or 5 times to get the compression reading. The gauge will hold at the highest reading until you release the air. Then you compare all the readings to see if one is very much lower than the rest.
When doing a leak down test, you screw the tester into the cylinders (one at a time), with each cylinder at TDC compression stroke, and then pump it up to about 100 psi and see if it holds compressed air.
================Ahhh, long thread. I forgot about that, but it might take a while with the air hose connected to get that air to the surge tank. I would think if it is a HG problem, a block test would be quicker, easier and more accurate. Wouldn't you agree?
Hey guys! My old high mileage 250k+ Eldo keeps overheating, right on into 230+, just idleing, or driving. Uses no coolant. Passed the expansion tank blue liquid test. Liquid never changed. Still pretty blue, even after 10 minutes of testing, after engine had just been over 230. Took out almost new radiator and cleaned it. It was good. Drained block. Removed thermostat and flushed block till clear, then put Blue Devil cleaner in. Been in for 4 days now, starting and letting warm up to 230 a couple times a day, no change. Only thing else I can think to do, is put the compression tester on each cylinder and see if its blowing any bubbles. I still think it's the head gaskets, but it's not using any coolant at all, the exhaust ends look great and it passed the blue liquid test! Anybody have any other ideas? Hate to give up on the old girl. Still runs good. Thanks for any replies!
His 1995 (and your 1998) do not have fan clutches. The 2 fans are electric and operate together - with no A/C compressor function set the fans go to SLOW at 224 degrees and to FAST at 236. They normally don't run at over 30 mph - not needed. If you set A/C or DEFROST then they run in SLOW all the time to insure airflow through the condenser in front of the radiator..........have you checked your cooling fan clutch?
========================Thanks, but, it's got electric fans, and they are working. The guys set me straight on how I was doing my compression test wrong. Am gonna do it right, as soon as the weather cooperates a little. Been raining for days here, now cold and windy. Maybe this weekend I'll get to finally confirm a leaking headgasket(s), or not.
=====================Yea, I know, but I've checked out every possible other thing that it could be, and it's none of them. And it has all the symptoms of blown headgasket(s). Comp test will confirm it, for sure.
With some A/C compressor function set the fans run in SLOW all the time. In that condition fans should never go to FAST. They should never cycle on and off with the A/C or DEFROST set.Sub, you've got me wondering now, if the fans aren't even working on high. I used to remember it always idling in summer, with ac on, and fans kicking on high, then off. But the thing is, it never used to get over 199-200, idling.