Usually an increase in idle speed is due to an advance in timing, since you did not adjust the minimum idle air, or the fuel mixture.
Did you disconnect the advance when you set the base timing?
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Question
Submitted 313 days ago...
How do you set the timing on a 1992 Isuzu pick-up after changing the timing belt and pulling the dist. cap?
A couple of weeks ago I replaced the timing belt on my 92 isuzu pick-up. In the process I moved the crankshaft and camshaft messing the timing up. I have tried setting the timing and TDC. The truck runs but the RPM is running high while in fifth gear. There is no backfire but the problem is it idles very high while in 5th gear. What am I doing wrong and what can I do to make it run better while in 5th gear?
Please Help!
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Answer 1 / 4 -
Submitted 313 days ago...
Answer 2 / 4 -
Submitted 313 days ago...
Yes, I believe I did disconnect it. Let me make sure. Is it the hose thats connected to the distributor cap? If thats the one, then I did disconnect it and plugged it. After plugging it I set the timing to specs. I hope I did it right.
Answer 3 / 4 -
Submitted 313 days ago...
Yep, you did, and I have to ask that question.
Are you absolutely sure you have the timing marks set exactly where they should be?
And did you mark the block and the sprocket before belt/chain removal?
This answer was edited by the_mekanic 313 days ago.
Reason: ed
Answer 4 / 4 -
Submitted 313 days ago...
Yes , i believe I did set the marks when installing the new belt. I did not make any marks before romoving the belt. That was the one crucial mistake I made before romving the belt and turning the camshaft and crankshaft.
It runs nice and does NOT backfire or pop from the carb. It just runs at a high idle while in 5th gear. I am using a little more gas with it running at a higher RPM.
I am out of suggestions for myself, therefore I am here.
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