1984 Toyota Pickup Rough Idle Black Smoke

TOYOTA PICKUP
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CODYSKYLINE
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This has me stumped! 1984 Toyota truck 4x4 22-r carburated- When start engine idles very rough with lots of black smoke. Then after it heats up and its nice and hot and only then with the engine off hood closed. Then fire it back up it runs like a top perfect idle. Ive checked the choke, pvc valve. I live in idaho and in the winter it doesn't heat up enough in the engine compartment to trigger the problem. does not use any oil. Also the engine oil turns black soon as i change it. I can usuallly fix most but this has me. Thanks in advance for any advice.
Mar 16, 2007 at 1:42 AM
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MMPRINCE3000
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Probably need to have the carb checked or replaced. The floats could be bad etc. at any rate too much fuel can cause engine damage.
Mar 16, 2007 at 4:03 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
[quote:939df9aaf7="codyskyline"]This has me stumped! 1984 Toyota truck 4x4 22-r carburated- When start engine idles very rough with lots of black smoke. Then after it heats up and its nice and hot and only then with the engine off hood closed. Then fire it back up it runs like a top perfect idle. Ive checked the choke, pvc valve. I live in idaho and in the winter it doesn't heat up enough in the engine compartment to trigger the problem. does not use any oil. Also the engine oil turns black soon as i change it. I can usuallly fix most but this has me. Thanks in advance for any advice.[/quote:939df9aaf7]

Could be your choke plate sticking-closed
Mar 16, 2007 at 11:37 AM
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TRAUMANAKED
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I have a 1984 4x4 that has this same problem. Did you ever figure out what was wrong?
Mar 9, 2012 at 3:15 PM

Suggested Repair

Inspect or replace the carburetor, including the floats, and check whether the choke plate is sticking closed. Excess fuel can cause black smoke, a rough cold idle, and engine damage.

Conversation Summary

The owner of a 1984 Toyota Pickup 4x4 with a carbureted 22-R reports a rough idle and heavy black smoke on startup. It runs normally only after the engine is fully hot, shut off with the hood closed, and restarted. The choke and PCV valve were already checked; it does not use oil, though the oil darkens quickly. Experts suggest a faulty carburetor or bad floats, or a choke plate sticking closed. No confirmed repair was reported.

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