I'm still new to the forum but have a 98 Civic Ex coupe with a cat delete and around 130k miles and it won't rev past 3.5k. Codes P0141 and P0336 show it could be my crank position sensor and my secondary o2 sensor. I already know I don't have an o2 sensor but is it probably causing the ecu to go to limp? I ordered a Magnaflow High flow cat with Megan headers and a Yonaka catback, will the ecu be able to recognize the secondary o2 on the cat when I install and reset it?

 

P0336 code is likely the issue that is causing major drive ability issues.

 

the crank position sensor is whats causing the limp mode, cuz it cant tell if the engine in time still

ive had a bad rear o2 sensor in my integra and didnt cause and problems except a CEL

 

Sweet, thank you both for the quick replies. I'll try replacing the crank sensor and see if it does any help. Any suggestions for where I should buy one?

 

Just looked up the CKP, and since I have a d16y8, I believe it's in the distributor? I bought the car not too long ago and the owner said that the distributor was replaced recently along with the rotor, spark plugs and wires. I'll still check out the sensor but what would be the next problem if it rules out?

 

ckp is what's causing the limp mode. secondary o2 has absolutely no effect on how the engine runs.
if you have a ckp code, either the ckp sensor is damaged, or the wiring for the ckp sensor is damaged. those are the only things that will cause that code.

 

Yeah, I stayed up last night doing some more research and found most owners had either frayed or corroded wiring to the sensor. And I know now that the sensor is near the pulley, and the ckp sensor rotor is at the distributor. I'll try working on it this weekend so I'll be able to update if it fixed it or not. Thanks!

 

ckf is at the pulley. that won't cause limp mode though.

 

Ohhh, so it is in the distributor? I guess I just confused myself and see that the crankshaft fluctuation sensor is near the pulley?

 

if you use an obd1 distributor, the ckp is in the distributor. if you're still using the obd2 distributor on that obd2 engine, the ckp is near the crank pulley.

and yes, if there is something wrong with it, it definitely will cause limp mode.

 

hmm, I'm still new so how can I tell if it's an obd1 or obd2? I checked the wiring, didn't show any signs of fraying. I was gonna do a voltage check later today to the connections and see if they're up to par. I also think I found the connection to the (if not the ckp in the distributor) the ckp wiring near the pulley, should it run behind the block? I tried tracing any wires that were leading down near the lower timing cover and that was all I found, not sure if that's the connection I was looking for.
The only thing I DID notice though was that the S terminal connecting to my starter looked like it got snipped and put back in, but my codes don't associate with the starter and it starts up just fine. Also that this green connector near the TB was heavily coated in black stuff.

 

No. ckp is still in the distributor. ckf is the one at the pulley. it is for misfire detection to be obd2 compliant.

 

Okay, I'll have to take apart the distributor then in order to check with the ckp. So I'm looking to see if this thing is damaged or non-operational? How will I know?

 

Use an Ohmmeter and test the resistance of the CKP, it is a Magnetic VR sensor. If the resistance isn't on par with the Honda specs it will need to be replaced.

You should read between 350-700 Ohms of resistance on these sensors. If the sensor checks out OK for resistance. Then you have to test the wires between the distributor and the ECU for continuity.

 

So I got around 388 ohms for the ckp from the male side of the distributor. I didn't get a chance to check for continuity. How exactly am I able to test this with the dmm again?

 

Google.com
how to check continuity

 

Sorry for the late update, but I do have continuity from the ECU to the distributor. So if the ohms are good and I'm getting continuity, what else could be the problem?

 

P0141 is gone since I got my cat back on with my new 02 sensor. All that's left is the P0336 code for the CKP sensor.. *sigh*

 

Anyone?

 

INCASE ANYONE HAS THE P0336 CODE RELATED TO THE CKP SENSOR!
I bought a new distributor and it got me out of limp mode. Original distributor should read TD-80U. Thank you everyone for the suggestions!