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94' ranger problem

i have a 94 ranger 4x2 with 150k miles...regular tune-ups(plugs, oil and filter) its always been cold natured, not wanting to stay running in winter till it warms up. but its been doing it all summer and not just while warming up. revs low then back up. A/C makes it worse..rotorand cap look good, plugs are gapped within specs.. i was thinking the choke...cant afford to be wrong though HELP! thanks

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Link opined in news: snipped-for-privacy@4ax.com:

Oh my! I think, if you're going to work on this vehicle, you had better learn how its systems operate.

First, the fact it's a 4x2 means nothing... you didnt include what engine.

Second there's no "choke"

Go to the library and find book on Ford or Bosch FI systems by Charles O Probst:

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Read it thoroughly

Now go to google and search this group on your problem..

In point of fact, your intuition may be right in that the problem is at the throttle area.

Main suspect: the Idle Air Bypass or Idle Speed Control mechanism (same thing) dirty/sticking

  1. NEVER adjust throttle stop screw except as absolute last resort

  1. NEVER use CHOKE cleaner.. look for product that says it's safe for FI and electronics.

At least get a Haynes book on the vehicle, you cant afford to NOT have a reference.

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Backyard Mechanic

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Link opined in news: snipped-for-privacy@4ax.com:

Could be... the key is it is safe for FI engines.. ask parts counter guy.

Get the book, at least. before you start

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Backyard Mechanic

thanks for your help

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