Hi all, bought a 99 Civic EX in shambles recently. It had a blown GSR engine in it when I bought it, the only part I retained from it was the wiring harness. It has a d16z6 complete rotating assembly, d16y8 head casting/valves, and a y7 cam and rocker assembly. The head has the z6 cam gear on it, and is using the standard z6/y7/y8 belt. It is a Frankenstein collection of parts, but they are all known good. It is running a virgin p06 with a jumper harness. The problems I am having with it are as follows:

1- Will start and idle at around 900 rpm's, but if given throttle it will die.
2- I am getting a constant code 41 (o2 heater), but have swapped in 3 different known good used ones
3- Codes 10 and 19 are present (IAT and AT lockup (p06 is AT)), I will address the IAT later, but it is not enough to cause the problems I am having now.

I have verified mechanical timing, verified fuel pressure (gauge on filter line), replaced the FPR with a known good, just to be sure, checked spark, and there is currently no cat on it, so it cannot possibly be clogged. It does run a LITTLE better with the distributor advanced all the way. I am stuck with this one, any ideas?

 

Is a Z6 cam gear different than a Y7? If so, maybe a Y7 cam gear would help.

What does a compression test look like?

 

compression was ballpark 180 across the board. there is supposedly a half tooth difference between the two, and the consensus was to use the gear that matched the block if using the y7/8 cam

 

But this^ does not account for the fact that your cam doesn't match the cam gear.

 

Right, I went off what I found from researching the head swap. I do have the gear and can swap it out, just not sure that is the issue.

 

^It's hard to know given the Frankenstein motor.

However, bad mechanical timing is the white elephant in the room, so if you have a Y7 cam gear give it a try and see what happens.

 

Will do tomorrow, we shall see. I have the crank timing dead on, the genius who owned the block before me decided to do away with the lower timing cover, so I had to use the crank sprocket/oil pump.

 

Also, did you try starting fluid or check whether the injectors spray fuel while cranking the engine?

 

Update: did the cam gear swap today, no luck, symptoms persist. Ron- I know it is getting fuel, but I will pull the rail and verify each injector is spraying.

 

Forgot to ask- does anyone have an ecu harness pinout for this car? I am going to wire the o2 directly to it, seeing as it helps control fuel mapping and for some reason is not being read by the ecu.

 

Code 41 - Dust off the multimeter. Test fuse 15 and whether the primary O2 sensor connector gets battery voltage from fuse 15. Also Ohm test the heater element.

 

got tired of messing with this setup. grabbed a z6 head from the yard, will be putting it on tomorrow. i will post back with results, including remaining cel's.

 

whelp, i built the franken head correctly, same issues persist with the new head. motor is now a complete z6, cam timed @ inner cover pointers, crank timed @ oil pump and pointer. did a distributor guts swap, so all 3 tabs line up on the z6 head, tried a known good y8 distributor as well. im about ready to burn this car.

 

Swap out crankshaft fluctuation sensor with known good one.

 

car is running obd-1. ckf is a non issue.

 

problem ended up being a bad ecu conversion harness. have it running obd-2 now, with ckf bypass trick.

 

Good work!

But, it's still no FrankenBrent (Hatley).. lol

 

This thread gives me inspiration for a Z6 head... it just does.

 

if you swap your pistons for different d series ones, no problem.