300 stumbles when cold
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More Turbo
Joined: Jun 2001
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300 stumbles when cold
when I first start my 88 300 it seems to have a difficult time maintaining a steady idle. the engine vary's from 900-400- rmps. also when I try to take off it just seems to sputter, and I really have to ride the clutch. it also does the same thing when it has less than 1500 rpms and I give it gas ( i.e shifting from 2nd- 3rd). all of this disapears once the engine is warm. I have checked the TPS and voltage readings seem to be in the norm. I am thinking that it may be a engine temp sensor that is suppose to adjust fuel mixture depending on engine temp. any other ideas. or where would this sensor be located??
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Joined: Jul 1999
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300 stumbles when cold
The coolant temp sensor is located on the pipe from the thermostat housing , Its cold resistance should be in the 37 to 58K Ohm range with the coolant temp in the 50 to 70 Deg range . Normal operating temp you should see readings in the 1 to 3K Ohm range . Check the Air Temp Sensor as well , its located on the Number 1 intake runner of the lower intake , Its Ohms readings should be the same as for the coolant temp sensor , Maybe a little higher when hot because the air temp in that area will likely be less than the coolant temp .
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More Turbo
Joined: Jun 2001
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Likes: 1
300 stumbles when cold
I finally got a chance to test my sensors today. when the engine is cold I am only getting about 27 ohm resittance instead of 37. this is on both sensors. when they are plugged in I am only getting about 2.66 volts on them (a 5.00 volt ref.). are theese readings normal?? or could this be my problem with the cold engine.
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