Question about 2003 Cadillac CTS

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2003 cadillac cts 3.2 liter..rough idle, scan tool shows misfire on bank 1, cylinders 1,3,&5. only at idle, scan tool also showed a cam postion sensor code. cam position sensor changed. no change in idle. clyinder compression test, and cylinder leakdown test performed on all cylinders in that bank. all cylinders in both tests were within specifications. spark plugs replaced on that bank. On road test vehicle has lots of power and acceleration. problem only accurs at idle. any suggestions would be greatly appreciated.

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  • Anonymous Mar 14, 2014

    CADILLAC CTS 2003

  • Anonymous Mar 23, 2014

    cam position sensor

  • Anonymous Mar 23, 2014

    code 346

  • Rocky Ram
    Rocky Ram Jan 31, 2019

    looks like a coil pack it runs all 3 cylinders...1,3,and 5

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Did you ever find a solution to this? I am having the same issue on 2,4,6. I have replaced the coils. checked the intake for vacuum leaks. I am lost here let me know if you find anything and I will do the same.

Posted on Jan 24, 2011

  • dkmarr Jan 25, 2011

    Not sure if you got this fixed or not but I am being told that my engine jumped time. I changed the water pump on mine and this started happening after. I was told that if they get coolant on the belt it can cause it. Also these belts stretch. I am going to at least verify this tomorrow night and I will post on here.

  • dkmarr Jan 26, 2011

    I know you did a leak down test, but you need to pull the front cover off and inspect the cam gear timing marks. Mine was the exhaust cam on bank two. It was off by one tooth. Since you said that you had performed a leak down test I did the same before I fixed the timing belt. Mine came back within spec also. I can also tell you that there really is not much other that can cause a complete bank to misfire and then get better with higher RPMs. Take a look, I would bet that you just jumped a tooth.

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Check the timing belt and related parts. One cam sprocket off time will cause this condition with codes for random misfire and 1 3 5 misfire or 2 4 6 depending on which side.

Posted on Jan 16, 2016

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Mine is doing same thing and saying cylinders 1,3,5 are misfiring. Idles rough as well. Now it started occasionally saying engine power reduced and won't let me accelerate. I can tell when it is going to do it because the transmission shifts very rough. Any suggestions?? Thanks

Posted on Dec 04, 2014

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1 Answer

Which cylinder is number 1


As you look from the front of the vehicle, the lower left cylinder is number 1. going up, they are 3 & 5. The right side bank is 2, 4 & 6.
If the banks are horizontal, then the top bank, left to right, is 1, 3, 5; bottom, left to right is 2, 4, 6

Jul 22, 2014 | 2005 Cadillac CTS 3.6

1 Answer

1,3,5,7 cylinder miss fire


Bank1 failure.

my guess, those DTCs off a cheap scan tool>? why not post source and real codes, no lie P0301 is real. but off what?

real engine: Name.

4.7 L 2UZ-FE V8

VVT-i variant??? got VVT? IF ONE SIDE FAILS, misfire there. if cam retarded. if bad, can be 14deg retarded, (huge)

see cam action here.

http://www.mr2.com/files/mr2/techinfo/Random%20FSM%20Data/2uz-History.pdf





2003 Tundra.

if using a full real scan tool that sees all toyota extended DTCs , you might see VVT errors, $20 tools and lame autozoned , blind .

there are 4 sensors there, id bet there are codes you missed!



P0301,3,5, and 7, DTC, ONLY?

bad coil packs? no.



thats the whole left bank, bad.

RF 2-4-6-8

LF 1-3-5-7

so, VVT bad on left bank or coil pack ,

yours has 8 COP coils, so its not 4 bad COPS.

a real mech sees all this in 1 second , online, impossible

nor country. sold.\'



could the timing belt slip only on one side

did you do timing belt service, on time, if not, bingo.



misfire is

bad compression (vvt?)

bad spark , no, not all 4

bad fueling, but there is only 1 maf/map, and one full injection rate there so not fuel mix.related.



here is a tool (most AZ stores clueless)

that reads the enhanced DTC of Toyotas



http://www.amazon.com/gp/product/B001QIUGVI/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1#productDetails



using a 1996 tool , misses the boat.

but id bet your VVT is bad. left bank.

the real tool might help. here.

P1349

P0011 Diagnostic Trouble Code Discussion for
Camshaft 1 Position Sensor Target Performance
P0012 << or this>? P0020/21/22?



the FSM shows the manual tests for these VVT parts.

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2007 cadillac cts engine cylinder misfire


Error code p0300 indicates rough idle and p0305 indicates engine misfire in cylinder 5. Check for faulty spark plug and its wiring. Also check for ignition coil and distributor. Replacing spark plug and its wiring may resolve the issue.

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On my cadillac devill 2003 Rough idleing when it reaches normal tempretuer and check engine light gets on


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2003 kia sedona rough idle--check engine light comes on with codes on 1-3-5-cylinder misfires--plugs have been changed, wires changed----it is a replacement engine which had about 70,000 miles on it with...


The only thingI can say is that there is a problem that is affecting the entire bank on one side of the engine. This automatcally eliminates things like Mass Air Flow (MAF) sensor, Manifold Absolute Pressure (MAP) sensor, Throttle Position Sensor (TPS), Crankshaft Position Sensor (CKP) etc. because failure of these things will affect BOTH banks, not one.

I have seen things like a totally skewed upstream Oxygen sensor on one side cause misfire codes for all cylinders on one bank. It is pretty rare, but it CAN happen. This can usually be verified by graphing the O2 Sensor PIDs for both sensors and comparing the graphs.

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Hi my 2006 cadillac cts has error codes po 300 303 305 343 347 368 392 and 496 can u tell me what they are or a website to find out thank u


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