1990 Honda Accord Idle Rough When Engine Is Cold

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Old 09-20-10, 02:35 PM
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1990 Honda Accord Idle Rough When Engine Is Cold

1990 Honda Accord LX, 209,500 miles, 4 Doors, AT. Idle very rough sometimes stop when engine is cold in the early morning. If engine stops, I have to restart it and push gas padle to warm up. Once engine warmed up, it runs like normal. Any idea and where to check up? Thanks!
 
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Old 09-20-10, 02:52 PM
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Given the mileage post the results of a compression test and cylinder leak down test, Rule out vacuum leaks using a vacuum pressure gauge. Are there any codes? Using a fuel pressure gauge post the psi values for fuel pressure and volume
 
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Old 09-20-10, 05:12 PM
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No codes, check engine light is normal. No millage per gallon lost, too.
 
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Old 09-20-10, 06:50 PM
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well, i had a very stubborn, can't kill, 91 civic with exactly same issue. 186 000 miles. had her for about a year.
so, things that worked and things that did not work:
1. cleaning fuel system did nothing
2. replacing spark plugs and wires did nothing
3. replacing all engine mounts helped with shake, but not idle
4. removing idle air control valve and cleaning it actually did help some
5. what really worked was simply manually adjusting idle with set screw. simple and easy. i had 94 Mitsu LRV, had to do same.

in general, it's call for idle control system overhaul, new plugs, fuel filter, air filter, distributor cap and rotor. couple cansBeer 4U2 of seafoam through the fuel system.
 
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Old 09-20-10, 07:10 PM
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No codes is a good sign. Fact that fuel economy hasn't been impacted means nothing. At you're earliest convenience, post the results of the rest of the tests.
 
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Old 09-21-10, 05:40 PM
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His question got me wondering about something: How do these newer computer cars decide it is cold out, and have to say make compensation for that by feeding more gas to the injector(s) or?
 
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Old 09-21-10, 06:53 PM
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Originally Posted by ecman51` View Post
His question got me wondering about something: How do these newer computer cars decide it is cold out, and have to say make compensation for that by feeding more gas to the injector(s) or?
they have temp sensor. i had scangauge connected to OBD2 port in several vehicles driving, and each one shows air intake temperature.

plus, they have coolant sensors.
 
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