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Old 04-08-2011, 03:37 PM   #1
laribel
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Default ignition test vs. CPS test for no start troubleshooting

If I have tested the plug wires with an ignition tester in place of spark plug grounded to the engine (and there was spark), is there a need to test the CPS as in richpins video by observing arc on coil pack? Or would doing so be basically testing the same thing?

If spark goes through the plug wires, it has to be going through the coil pack, right?
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Old 04-08-2011, 04:47 PM   #2
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Default Re: ignition test vs. CPS test for no start troubleshooting

If you mean those inexpensive spark testers that don't require removing the plugs and using the internal gap between electrodes to act as a spark plug then yes you're testing for spark. A successful spark test for any plug already confirms an operating cps but not completely. This can be taken out of context by asking only a focused question. What you haven't done is test for when the engine is fully warmed up and spark is lost unless you performed two spark tests, one with a cold engine and after the engine dies at random and conduct another spark test right at that moment when the engine cannot be restarted. Testing for spark encompasses the entire EFI system including failure with a fully warmed up engine or at anytime when the engine fails to start. Just don't assume a cold engine test is all that's needed.
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Old 08-30-2021, 02:14 PM   #3
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Default Re: ignition test vs. CPS test for no start troubleshooting

Wherever you check for spark is OK to see if CKP signal is good.

What problem are you trying to solve; is the engine refusing to start, or keep running, or runs poorly at times? As said above, you have to check things when the problem pops up.
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Old 08-30-2021, 02:45 PM   #4
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Default Re: ignition test vs. CPS test for no start troubleshooting

Quote:
Originally Posted by billr View Post
What problem are you trying to solve;
billr, the problem that spambot is trying to solve is to get you or anybody to click the link embedded in its fake post. Note the subtle signs:
1) It is responding to a decade old post
2) It has spelling worse than most (but not all!) of our members.
3) It makes slight changes to old posts and tries to repost them to make them seem like a real person, like:
original:
If spark goes through the plug wires, it has to be going through the coil pack, right?

spambot:
On the off chance that sparkle goes through the fitting wires, it must be going through the loop pack, correct?
...
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