How does the CCT work???
Thread Starter
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
How does the CCT work???
I've ran it on my scangauge and it appears to have 2 parts to it. But I really have no idea what it's doing. Does the 1st part issolate each cylinder and put a load on the injector, or cut power or something? In what sequence does it test - 1 thru 8, or does it go one bank then the other?
What is the 2nd part of the test doing or checking for? Does it individualize each cylinder?
Trying to better understand the test's function.
Thank you in advance!!
What is the 2nd part of the test doing or checking for? Does it individualize each cylinder?
Trying to better understand the test's function.
Thank you in advance!!
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
I don't recall 2 distinct parts to the CCT. I'm using the AE scanner but it should run the test the same way.
The buzz test, KOEO, kinda has 2 parts though. It buzzes all the injectors for a couple seconds then does each one individually in numerical order 1-8.
KOER CCT determines if all cylinders are contributing equally by shutting down each injector individually in numerical order too. A cylinder that doesn't effect the idle quality is considered weak and might give a code.
Did you get any codes at the end of the CCT test?
I've ran this test on engines that were running perfectly and got codes. Also, had the opposite happen, a rough running engine that didn't give a code....I don't rely on the CCT for this reason.
The buzz test, KOEO, kinda has 2 parts though. It buzzes all the injectors for a couple seconds then does each one individually in numerical order 1-8.
KOER CCT determines if all cylinders are contributing equally by shutting down each injector individually in numerical order too. A cylinder that doesn't effect the idle quality is considered weak and might give a code.
Did you get any codes at the end of the CCT test?
I've ran this test on engines that were running perfectly and got codes. Also, had the opposite happen, a rough running engine that didn't give a code....I don't rely on the CCT for this reason.
Thread Starter
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Thanks Jim.
I've got an injector on the drivers side, I think the #8, that's giving me some problems. I've got a fast "slapping" sound when the engine is under a load. Just started out of the blue on Monday. I was able to pull the UVCH connection and the noise goes away. Tells me right there its an injector malfunctioning. Now just have to pull the valve cover to determine which one. (I am running a SD engine harness with only one connection per side now.)
The CCT seems to have 2 parts. The first one it seems to add fuel or something to each injector then the 2nd part take fuel away from it. Well the last cylinder/injector of the 1st part, the noise is extremely loud, whereas, it wasn't on the other 7 cylinders. I'm assuming from what you posted above, that it's the #8 that's tested last. It's not throwing any codes though, so not sure what's going on.
I've got an injector on the drivers side, I think the #8, that's giving me some problems. I've got a fast "slapping" sound when the engine is under a load. Just started out of the blue on Monday. I was able to pull the UVCH connection and the noise goes away. Tells me right there its an injector malfunctioning. Now just have to pull the valve cover to determine which one. (I am running a SD engine harness with only one connection per side now.)
The CCT seems to have 2 parts. The first one it seems to add fuel or something to each injector then the 2nd part take fuel away from it. Well the last cylinder/injector of the 1st part, the noise is extremely loud, whereas, it wasn't on the other 7 cylinders. I'm assuming from what you posted above, that it's the #8 that's tested last. It's not throwing any codes though, so not sure what's going on.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
My memory isn't what it used to be
..........the idle does kick up a bit before the CCT starts dropping cylinders one at a time. It's been a while since I've performed a one.
If this turns out to be a bad injector you'll be the first one that I know of that gained something from a CCT. I suspect a buzz test would tell you too if it's an electrical problem. Maybe it's something simple like a solenoid coming loose, wouldn't be the first time.
Yep it's #8. Here's the cylinder locations:
FRONT
2------1
4------3
6------5
8------7
FIREWALL
Time for stage 2's
..........the idle does kick up a bit before the CCT starts dropping cylinders one at a time. It's been a while since I've performed a one.If this turns out to be a bad injector you'll be the first one that I know of that gained something from a CCT. I suspect a buzz test would tell you too if it's an electrical problem. Maybe it's something simple like a solenoid coming loose, wouldn't be the first time.
Yep it's #8. Here's the cylinder locations:
FRONT
2------1
4------3
6------5
8------7
FIREWALL
Time for stage 2's
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
When i run the CCT on my truck it gives me codes for cylinders 2, 3, and 7... The truck runs just fine though. I'm with Jim, i'm not too sure the CCT really tells me anything worth knowing.. When i had stage 1's it would give me the same thing.. Also keep in mind the grey Ford CPS can effect the CCT.
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
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From: Hutchinson, KS
I guess I haven't updated my sig in a while. The truck already has stage 2's Jim. They're Hypermax big 2's running 200cc and 100% nozzles. I've also converted to the SD van turbo, BTS dual hpop, Hypermax tapercore I/C, ARP headstuds, and the Blue CPS. I'm not running a chip though cause I'm still on the stock trans. Even then, I'm still close to 325hp and it runs good.
The buzz test came back with no codes and all buzzed fine. Like I said above, when the CCT loads up the #8 (at least I think), the noise is very noticable. I knew what the cylinder order but wasn't sure if the CCT went down one bank (2,4,6,8) and then went to the other side. Or vice versa.
I talked to Cale at BTS this morning and he's positive it's an injector. Going to pull the valve cover tonight and unplug that specific injector to see if it stays or goes. I also asked him what could happen with the injector to cause it to sound like that. He said is best guess would be that it's leaking fuel down into the cylinder when it shouldn't be and causing piston slap. And that's the sound I'm hearing. He did stress to call Hypermax though and to not drive it very much until we figure out exactly what it is.
The buzz test came back with no codes and all buzzed fine. Like I said above, when the CCT loads up the #8 (at least I think), the noise is very noticable. I knew what the cylinder order but wasn't sure if the CCT went down one bank (2,4,6,8) and then went to the other side. Or vice versa.
I talked to Cale at BTS this morning and he's positive it's an injector. Going to pull the valve cover tonight and unplug that specific injector to see if it stays or goes. I also asked him what could happen with the injector to cause it to sound like that. He said is best guess would be that it's leaking fuel down into the cylinder when it shouldn't be and causing piston slap. And that's the sound I'm hearing. He did stress to call Hypermax though and to not drive it very much until we figure out exactly what it is.
Posting Guru
Joined: Nov 2001
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From: Ft Scott
Rather than going thru the hassle of removing the VC to unplug #8 it would be a lot easier to unplug the harness from the VC and then just remove the #8 wire from the connector. Even if you don't have the special little tool to unlock the pin from the body it's easily unlocked with just the smallest jewelers screwdriver.
