98 ex check engine light

[gaowee]

Hey allz,

i have a 98 civic ex, d16y8 running 10.0 comp with obd 2 to 1 on a p72 ecu. I'm running crome base map with boost option. My problem is that it run and idle fine untill i push it..taking it to 7k-7.5k rpm then i get a check light and it wont rev pass 6k. As soon as i turn off the engine the check light goes off and ican rev it to 7k again..its weird.. Plz help me out.

I try running the stock ecu and it rev to 7k all day long..no problem at all..i try to use the diag jump but as soon as i turn off the engine the cel light goes off too, so i cant check the problem code at all..

many thanks,
gao

[Sexicivic2000]

you should try and find a obd 2 scanner and take it in the car with you and have a friend operate it when the check engine light comes on it willl tell you the specific malfunction. I have had that happen before when vtec engaged to early

[gaowee]

damm your right i move the vtec down so when i shift at 7k i wouldnt fall off vtec..

i'll move it back to 5.5k and see how that do.

many thanks
gao

[siregcivic]

Hey allz,i have a 98 civic ex, d16y8 running 10.0 comp with obd 2 to 1 on a p72 ecu.

you should try and find a obd 2 scanner

obd2 scanners dont work with obd1

[Sexicivic2000]

OBD 1 scanner sorry !

[siregcivic]

OBD 1 scanner sorry !

meh ... just jump the service connector and read the cel's

all you do is put a paper clip or a piece of wire in the connector.. its by the ecu and watch your cel flash... 1 long is 10 1 short is 1.. so if you get 2 long and 1 short its code 21... there is usually a 2 second pause between codes

http://www.imagestation.com/picture/sraid112/p56a4adc8dc27b29a22cf2e721b751966/f8ff3724.jpg

1 O2A - Oxygen sensor #1
2 O2B - Oxygen sensor #2
3 MAP - manifold absolute pressure sensor
4 CKP - crank position sensor
5 MAP - manifold absolute pressure sensor
6 ECT - water temperature sensor
7 TPS - throttle position sensor
8 TDC - top dead centre sensor
9 CYP - cylinder sensor
10 IAT - intake air temperature sensor
12 EGR - exhaust gas recirculation lift valve
13 BARO - atmospheric pressure sensor
14 IAC (EACV) - idle air control valve
15 Ignition output signal
16 Fuel injectors
17 VSS - speed sensor
19 Automatic transmission lockup control valve
20 Electrical load detector
21 VTEC spool solenoid valve
22 VTEC pressure valve
23 Knock sensor
30 Automatic transmission A signal
31 Automatic transmission B signal
36 traction control found on JDM ecu's
41 Primary oxygen sensor heater
43 Fuel supply system
45 Fuel system too rich or lean
48 LAF - lean air fuel sensor
54 CKF - crank fluctuation sensor
58 TDC sensor #2
61 Primary oxygen sensor
63 Secondary oxygen sensor
65 Secondary oxygen sensor heater
71 random misfire cylinder 1
72 random misfire cylinder 2
73 random misfire cylinder 3
74 random misfire cylinder 4
80 Exhaust Gas Recirculation insufficient flow detected
86 ECT Sensor (Engine Coolant Temperature) circuit range / performance problem
90 Evaporative Emission Control System leak detected in the fuel tank area
91 Fuel Tank Pressure Sensor low input
92 Evaporative Emission Control System insufficient purge flow

[gaowee]

can i jump it while the engine is on? because when i turn off the engine the cel goes away. i havent had time to burn a new map with the vtec set higher but i have been driving up to 6k and i havent got a cel yet.

thanks alot guys i will try to jump the service connecter next time it comes on

[primercrxSi91]

iunno i ddint read all the post on this page but i no that auto zone checks ur engine light for free

[Sexicivic2000]

Yeah you should be able to jump it when the light comes on before you shut off the engine

[gaowee]

thanks i will try that this weekend and let u guys know what happen.

many thanks

[siregcivic]

i usually check my cel's if they show up with the engine on just incase it doesnt save it.. but usually the ecu will remember the cel in its memory even if it doesnt come back on.. i used to get a random 22 ( vtec pressure switch ) and it wouldnt always comeon but it was still in the ecu's memory...

[gaowee]

damm..hehe its the vtec pressure switch..i didnt come on all weak..now it popup...i had to jump the switch with the engine on..if i turn off the engine it goes out..and i wont show anything..anyone know how to fix the vtec pressure switch?

gao

[siregcivic]

get a new one... hell ive even replaced mine and if i push it in vtec for a while it does the same crap code 22.. but if i turn the key off and on its fine soo idk whats going on with mine..

just get a new one

[gaowee]

hey i was looking online and it said that 2 things can cause this problem..not enough oil..as i just did an oil change but i use 4qt only.. and the vtec crossover is set too low..hehe..

so i'm going to top off my oil today and change my crossover to 5k

i'll let u guys know what happen

[Sexicivic2000]

you got it replace that pressure valve and bump up the crossover top off the oil and you should be set If it still persists V-tec crossover is too low! hehe good luck