Weird, it starts fine, I drive and once it hits 3-4k it splutters and won't go pass 4k, so I just shift before 3k. Once it warms up though it revs all the way up. Any ideas? D16z6 95 civic

 

Bad coolant temp sensor?

 

Clean the FITV.

Its under the Throttle body and runs the Fast Idle till it warms up.

 

Okay I'll do that tomorrow and check back

 

^Possibly, or the O2 sensor.

OP - Post all CEL codes.

 

I don't have any check engine light on , and how can I tell if the coolant temp sensor is non functional?

 

I had another FITV from another z6 I had that was in better condition so I cleaned it and swaped it, no difference, still splutters around 3500k and won't go past 4k untill its warmed up.

 

K, follow Ron, he's really good at diagnosis.

Can you change O2s, or check it for spec at least.

 

Does the CEL work?

 

Yea when I turn the key it turns on then off, it doesn't come on when I'm driving. I tried jumping it to pull the codes and all it does is have a solid check engine light , doesn't blink or anything just solid till I remove the paper clip.

 

The next time the CEL turns on while driving, pull over and leave the engine running while you jump the service connector to pull the codes(s).

 

Okay will do but it doesn't come on often, hardly ever .

 

Be patient and ready.

 

Also noticed that my fitv line that comes out bellow the throttle body is plugged and I looked up the diagram and its not suppose to be plugged. The intake Mani I'm using is from a d15b . I also have a z6 Mani I can use but what's weird about it the Mani's are almost the same besides one vaccume port on the back which hooks into a sensor that goes to the carcoal canister. So idk if I can use it and idk why I couldn't if the z6 Mani is for the z6 engine, maybe cause my ej1 is made in Canada? Idk if any of this makes a difference just thought I'd add it in. Noob here still learning.

 

^Check the ignition timing with a timing gun. When was the last ignition system tune up?

Also post clear pictures of the IM, TB, IACV, and FITV.

 

I will post pictures within the hour, and i haven't done a ignition system tune up , I swapped the motor in about a month ago got it from a friend who went b series, had low miles and everything was running on it so I didn't bother with it. When I bought the car it had a d15b in it which is why some parts I have swamped around. This was my first swap lol.

 

Z6 Mani that was on the engine when I bought it

 

My Dad had the same exact problem with his last week. All he had to do was: replace the bank one 02 sensor, change spark plugs, spark plug wires, and a new distributor. It sounds like a lot, but believe it or not his car ran like a brand new, lol.

 

Bump

 

when it bogs, try going WOT and see if it clears up. o2 sensors can go bad and cause similar symptoms, while not causing a code.

 

he's really good at diagnosis.

 

Okay will try in the morning

 

Do an ignition system tune up and check the ignition timing.

Connect the coolant hoses as intended:




Also install the D16Z6 IM and connect the vacuum hoses as intended:



The PCV hose connects to the unlabeled IM nipple.

 

My z6 IM is plugd where the nipple should be in the back , idk why,also got a cell light it was 9 short blinks

 

Code 9 fits with the problem. Ohm test the CYL sensor from the ECU connector.