I put a b16a in a 91 crx, Every thing is good but the check engine light is on and it has a code 21 and when you are going down the road the check engine light goes off and comes right back on.

 

double check your wires,

 

I have been over the wires over and over again. Ever thing is right to my knowledge.

 

Take a volt meter and make sure ther is no cut in the wire. Then verify proper ecu location. Next verify ecu works. Last check the manual for the vtec troubleshooting procedure.

 

isnt 21 the vtec selonoid?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotor_B20_Hatch &raquo;</TD></TR><TR><TD CLASS="quote">I put a b16a in a 91 crx, Every thing is good but the check engine light is on and it has a code 21 and when you are going down the road the check engine light goes off and comes right back on. </TD></TR></TABLE>

I am having problems like that except I am having it with a code 4. What I did was I changed the wires and resoldered new connectors into the ECU. No more code 4. Its not normal for a code to just disappear. If it goes off, it goes off for a reason. It obviously can work, its either the wires or the connectors, if not, I'm not sure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PHOBIA &raquo;</TD></TR><TR><TD CLASS="quote">isnt 21 the vtec selonoid?</TD></TR></TABLE>

Yes

 

I know it's the vtec selonoid on a obd1, but i'm running a pr3 is that the same?
I'm new to the 88 to 91's , I have always run 92 to 95.(obd1)

 

you need sheilded wire... OMS

 

Honda ECU Diagnostic Trouble Codes Diagnostic Trouble Code (DTC) System Indicated
0 Engine Control Module (ECM)
1 Heated Oxygen Sensor (HO2S)
3 Manifold Absolute Pressure (MAP Sensor)
4 Crankshaft Position (CKP Sensor)
6 Engine Coolant Temperature (ECT Sensor)
7 Throttle Position (TP Sensor)
8 Top Dead Center Position (TDC Sensor)
9 No. 1 Cylinder Position (CYP Sensor)
10 Intake Air Temperature (IAT Sensor)
13 Barometric Pressure (BARO Sensor)
14 Idle Air Control (IAC Valve)
15 Ignition Output Signal
16 Fuel Injector
17 Vehicle Speed Sensor (VSS)
20 Electrical Load Detector (ELD)
21 Variable Valve Timing & Valve Lift Electronic Control Solenoid Valve (VTEC Solenoid Valve)
22 Variable Valve Timing & Valve Lift Electronic Control Pressure Switch (VTEC Pressure Switch)
23 Knock Sensor (KS)
30 A/T FI Signal A
31 A/T FI Signal B
41 Heated Oxygen Sensor (HO2S) Heater
43 Fuel Supply System