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Honda-Man, Honda Mechanic
Category: Honda
Satisfied Customers: 3085
Experience:  I have an Associates Degree in Automotive. 10 Years experience on all makes and models. 20 Years Honda only including factory training. Over 30 years total.
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1990 Civic. Starts great, idles good but after approx 15

Customer Question

1990 Civic. Starts great, idles good but after approx 15 mins, it begins to bog down, almost shutting off. Then after 5 mins of that, the check engine light comes on and then car runs GREAT. What's the issue here?
Submitted: 1 year ago.
Category: Honda
Expert:  Honda-Man replied 1 year ago.

Welcome to Just-Answer. My name is ***** ***** online handle is Honda-Man. I have over 31 years experience repairing Honda and Acura vehicles. I would be happy to assist you with your Honda or Acura question!

Do you have the code? When the check engine light comes on a code is stored in the ECM memory.

Thanks, Honda-Man

Customer: replied 1 year ago.
Sure do, code 6 is the only one that pops up.
Customer: replied 1 year ago.
FYI, I replaced the colant temp sensor already.
Expert:  Honda-Man replied 1 year ago.

Thanks for the reply and information. Please give me a few to look over my code info. Be right back.

Customer: replied 1 year ago.
No problem, I'll be standing by!
Expert:  Honda-Man replied 1 year ago.

Sorry for the delay.

When the code sets and it starts to run better it's going into back-up mode or limp mode. When this happens the ECM runs on a different preset program map.

If you still have code 6 popping up after replacing the TW sensor you must have a loose connection, bad new sensor, or ECM problem. I have included the Honda diagnostic flow chart for code 6. I have seen on many occasions loose or damaged metal terminal ends. The female terminals(2) in the TW sensor connector or in the connector C210 between the TW sensor and ECM. It will probably be at the sensor connector since it gets the most action being unplugged and plugged back in. There is only one connector between the TW and ECM which is C210. It only has the red/white wire going through it. The green/white wire runs through the harness to a common sensor splice so it should be OK. If you follow the flow chart and wiggle the connectors while you are testing the loose connection should be easy to find. Usually the metal spring tab in the female terminal breaks and falls out of the sensor unseen. It's meant to keep tension on the male terminal end. C210 should be on the top of the shock tower or close to it.

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Thank you! ~Honda-Man

Expert:  Honda-Man replied 1 year ago.

You can also try wiggling the connectors before the check engine light comes on. You might be able to get the light to come on or the engine to run rough?

Customer: replied 1 year ago.
Thanks Cliff!! I'll do the troubleshooting this weekend and see what happens!
Expert:  Honda-Man replied 1 year ago.

Sounds good if you have any questions along the way just ask.

Customer: replied 1 year ago.
Will do!
Expert:  Honda-Man replied 1 year ago.