Hard starting, low hunting idle, until it warms up? |
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Hard starting, low hunting idle, until it warms up? |
Geezer914 |
May 27 2017, 09:30 AM
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#1
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Geezer914 Group: Members Posts: 1,460 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States |
1975 1.8L Ljet injection. Car is hard to start. It takes 3-4 tries and some time a shot of starting fluid. Fuel pressure gauge reads 30 lbs. in engine compartment. The rpm rises to 1800 rpm for about 15 seconds, then the idle hunts between 500 rpm and almost stalling out. After the engine warms up it runs and starts as normal. Vacuum hoses are tight. Comments? (IMG:style_emoticons/default/confused24.gif)
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timothy_nd28 |
May 31 2017, 06:15 PM
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#2
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Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest |
280k ohms > 2.5-3.0k ohms, still out of spec.
The CHT would never be at 0 ohms, the engine would be damn hot for the CHT to be 0 ohms. Jumping your disconnected CHT terminal to battery ground would simulate a 0 ohm CHT condition to the ECU. I know the computer is robust but shorting this sensor wire to ground can't be all that healthy for the ECU. Also, grounding the end of a wire while observing for a change in engine performance proves nothing. If there is a bad connection within the harness, or a bad pin at the ECU plug, your ground at the end of the wire will never travel the full path and make it to the ECU. When you remeasure the resistance of the CHT sensor, measure the resistance from the ECU connector between 13 and 5. Also state the temperature along with your measurement. Since you are doing that, might as well check the resistance between pins 13 and 16 and again between 13 and 17. All measurements should be equal to one another. |
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