02-06-2014, 07:44 AM
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#1
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Join Date: Jan 2014
Location: Middle River, MD
Posts: 141
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Member
Join Date: Jan 2014
Location: Middle River, MD
Posts: 141
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How to run a compression test?
I'm sorry if this has been asked already but my search capability is bound to tapatalk. I've been through the FAQ and haven't seen anything on this. Was wondering if anyone had written up a how-to compression test our engines.
I understand the theory behind it:
1. Disconnect power to fuel pump.
2. Remove spark plugs
3. Install compression tester
4. Start engine with throttle open
Does that sound right?
Also, would i be putting everything(intake box,MAF) back together on the pass side after removing plugs and before testing?
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02-06-2014, 08:13 AM
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#2
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Join Date: Sep 2013
Location: Greenville, SC
Posts: 179
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Join Date: Sep 2013
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I've never done compression tests that in-depth. All I've ever done (and with great success) is:
1) Disconnect spark plug wires
2) Remove spark plug to test compression
3) Install compression tester
4) Crank engine (couple seconds to ensure full compression reached)
5) Repeat for every cylinder
That's all that is really needed
Max
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02-06-2014, 11:29 AM
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#3
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Senior Member
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Join Date: Oct 2010
Location: Charleston SC
Posts: 1,196
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Senior Member
Join Date: Oct 2010
Location: Charleston SC
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I think you are only supposed to remove the spark plug that you are testing . leave the rest in ? Then put the spark plug back in , and move the tester to the next cylinder?
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02-06-2014, 12:34 PM
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#4
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Join Date: Aug 2013
Location: Florida
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Join Date: Aug 2013
Location: Florida
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Video below is a guy who does it on his 3rz, should be the same on the 5ze.
3RZ-FE Compression Test - YouTube
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02-06-2014, 12:37 PM
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#5
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Join Date: Apr 2010
Location: Eastern PA
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Quote:
Originally Posted by clemson4r
I've never done compression tests that in-depth. All I've ever done (and with great success) is:
1) Disconnect spark plug wires
2) Remove spark plug to test compression
3) Install compression tester
4) Crank engine (couple seconds to ensure full compression reached)
5) Repeat for every cylinder
That's all that is really needed
Max
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That's how you do it!
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02-06-2014, 02:13 PM
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#6
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Join Date: Aug 2013
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Don't forget to remove the fuel relay, unless you like flooding your engine...
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BUILD THREAD | Flickr
97 2.7 4x4 5spd, OME 881 / 890, Cooper Discoverer A/T 3, blacked out 16" split 3s, Savage Sliders. LCE Street Headers, Marlin HD Clutch.
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02-06-2014, 03:32 PM
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#7
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In addition to your initial list:
1. all spark plugs out when performing test
2. likely need charger on battery to make sure that it does not affect results.
3. looking for more than 10% difference between cylinders.
Buckaroo
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02-06-2014, 06:58 PM
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#8
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You HAVE to block the throttle open to get correct results,period.
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02-07-2014, 07:14 AM
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#9
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Yes, besides all plugs removed you must hold engine wide open throttle.
If you have a good battery charger put it on the battery during the test.
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