91 crx z6 code 43 problems
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Honda-Tech Member
Joined: Oct 2011
Posts: 34
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From: Hilo, Hawaii
91 crx z6 code 43 problems
Car:
91 crx base
D16z6 swap
Obd1 p28
Obd2 injectors (no resistorbox)
Intake mani - tried pgmfi and stock z6 with new intake gaskets
New o2
Cap, rotor, plugs
Main relay
Tested fuel pump
-- new or verified working parts --
O2
Tps, map, iacv, ect sensor, fpr, fuel filter, main relay, stock p28, tuned p28, fuel lines and return
Timing set correctly
Car runs fine, pulls hard and fogs the tires for about 5 minutes until it shows code 43, after which it bogs and runs terrible until 3500 rpm, then it's drivable to get back to my house. I tried so many things and have asked many Honda specialists or hobbiest and I've changed or checked everything they suggest and of course everything this forum has to offer. I've been working on this for a year any help is greatly appreciated. Thank you
91 crx base
D16z6 swap
Obd1 p28
Obd2 injectors (no resistorbox)
Intake mani - tried pgmfi and stock z6 with new intake gaskets
New o2
Cap, rotor, plugs
Main relay
Tested fuel pump
-- new or verified working parts --
O2
Tps, map, iacv, ect sensor, fpr, fuel filter, main relay, stock p28, tuned p28, fuel lines and return
Timing set correctly
Car runs fine, pulls hard and fogs the tires for about 5 minutes until it shows code 43, after which it bogs and runs terrible until 3500 rpm, then it's drivable to get back to my house. I tried so many things and have asked many Honda specialists or hobbiest and I've changed or checked everything they suggest and of course everything this forum has to offer. I've been working on this for a year any help is greatly appreciated. Thank you
Re: 91 crx z6 code 43 problems
Obd2 injectors (no resistorbox)
Main relay
Tested fuel pump
fpr, fuel filter, main relay, fuel lines and return
Car runs fine, pulls hard and fogs the tires for about 5 minutes until it shows code 43, after which it bogs and runs terrible until 3500 rpm, then it's drivable to get back to my house.
43 Fuel supply system circuit (except D15Z1 engine)
okay think i figured my cel code. one of the vacume hoses wasnt hooked up to the intake manifold. so im going to T-split one of the near by vacume hoses and hope that will fix my problem. it should because if i cover the inlet the engine begins to stall but goes back to normal when i dont cover th inlet. must be a sensor there monitoring the air fuel mixture
A $3 gas cap from walmart cancelled my code out a while ago, sorry for no progress report. I was a little pissed when it got fixed to be perfectly honest because I had wasted so much time, money and effort on things that may not have been the problem. Atleast I can cross them off future lists though.
Thread Starter
Honda-Tech Member
Joined: Oct 2011
Posts: 34
Likes: 0
From: Hilo, Hawaii
Re: 91 crx z6 code 43 problems
Thanks for the reply,
I have a new o2, fuel filter and tested the fuel pump and return lines from the fpr, and with a different fpr as well. My gas cap had a good amount of back pressure wen I opened it. Never even thought to check that but I'm pretty sure pressure means its sealed right? I'm going to go over all the vacuum hoses now to check hopefully I'll find one.
Also,
Purge cut solenoid - should I use the one on the firewall or the one on obd1 mani? I know they're the same thing, but for preference and lack of needing to extend wires, I'm using the stock one on the firewall. Also tried changing the iat, the white one with two plugs on the mani. Suggestion from a friend and it made no difference. Will post any vacuum leaks
Thanks for the help
I have a new o2, fuel filter and tested the fuel pump and return lines from the fpr, and with a different fpr as well. My gas cap had a good amount of back pressure wen I opened it. Never even thought to check that but I'm pretty sure pressure means its sealed right? I'm going to go over all the vacuum hoses now to check hopefully I'll find one.
Also,
Purge cut solenoid - should I use the one on the firewall or the one on obd1 mani? I know they're the same thing, but for preference and lack of needing to extend wires, I'm using the stock one on the firewall. Also tried changing the iat, the white one with two plugs on the mani. Suggestion from a friend and it made no difference. Will post any vacuum leaks
Thanks for the help
Re: 91 crx z6 code 43 problems
Thanks for the reply,
I have a new o2, fuel filter and tested the fuel pump and return lines from the fpr, and with a different fpr as well. My gas cap had a good amount of back pressure wen I opened it. Never even thought to check that but I'm pretty sure pressure means its sealed right? I'm going to go over all the vacuum hoses now to check hopefully I'll find one.
Also,
Purge cut solenoid - should I use the one on the firewall or the one on obd1 mani? I know they're the same thing, but for preference and lack of needing to extend wires, I'm using the stock one on the firewall. Also tried changing the iat, the white one with two plugs on the mani. Suggestion from a friend and it made no difference. Will post any vacuum leaks
Thanks for the help
I have a new o2, fuel filter and tested the fuel pump and return lines from the fpr, and with a different fpr as well. My gas cap had a good amount of back pressure wen I opened it. Never even thought to check that but I'm pretty sure pressure means its sealed right? I'm going to go over all the vacuum hoses now to check hopefully I'll find one.
Also,
Purge cut solenoid - should I use the one on the firewall or the one on obd1 mani? I know they're the same thing, but for preference and lack of needing to extend wires, I'm using the stock one on the firewall. Also tried changing the iat, the white one with two plugs on the mani. Suggestion from a friend and it made no difference. Will post any vacuum leaks
Thanks for the help
Thread Starter
Honda-Tech Member
Joined: Oct 2011
Posts: 34
Likes: 0
From: Hilo, Hawaii
Re: 91 crx z6 code 43 problems
The stock crx has the map and the little purge canister on the firewall, and the obd1 manifold I'm using from the stock z6 has the map on the throttle body, and the purge canister is mounted on the rear of the manifold on the driver side. I read a forum where one guy said it was the purge solenoid one time and it got me thinking which is preferred? The stock one on the manifold is the one I'm using with the vacuum lines all connected, but the one on the manifold has the connection for the vacuum line broken off. Does anyone think it matters which one I use, or if this sensor would have a significant affect on my problem?
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