msupra1 Posted November 2, 2013 Share Posted November 2, 2013 I'm posting this for a good friend. He has a bone stock 95 Supra RZ 6spd with approx 190,000 KMs on the motor. Start up idle is good once it warms up a bit it will usually idle at 500rpm. After cruising for 10-15 minutes the warning light in the middle of the dash and check engine light will come on. When car is turned off and started the check engine light will go away.. and samething would keep happening. Occasionally the car started to idle good around 900rpm and the check engine light would not come on after some hard cruising.. this would be sometimes when it's fully warmed up. It usually wouldn't last long and it would start to idle around 500rpm and check engine light coming on. He brought it in for a computer diagnostic yesterday, check engine light would flash 4 times, pause, and then 2 times, and repeat. He was told it could be the 2 pin coolant temperature sensor which I helped him replace today. That didn't really help same issue as before. Also the catalytic converter was replaced with a lower mileage one just recently as well since it was rattling inside. I'm thinking it could be some dirty sensor, any idea's ? Quote Link to comment Share on other sites More sharing options...
Ian C Posted November 3, 2013 Share Posted November 3, 2013 Code 42 is the vehicle speed sensor, which is only triggered once you're driving. It's a common issue, have a search on here for it - usually it's dodgy speed conversion/delimiter wiring or a broken track in the speedo module that can be resoldered. It's nothing to do with the temperature sensors, so good work though by whoever got paid to do the diagnostics Low idle could be overfuelling due to a dirty O2 sensor. Quote Link to comment Share on other sites More sharing options...
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