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cold start nightmare 200

uid 18083's pic
posted by  lucid on  Fri Jan 2 00:42 CST 2004
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

" Are they meant to click on ON or only when IGNITION?"

There are actually TWO FI relays for the LH 2.0. The "System" relay turns on with Key ON to power up the AMM and ECU.

The "Fuel" relay (BL/GN wire on terminal 85) is turned on by the ECU (grounding the BL/GN wire), but ONLY when it senses Ignition Pulses from the Coil negative (terminal 1).
The Fuel relay powers the Pumps, Idle Air Control, and Injectors.

You didn't say where you are, but Cold temps might affect connections at:

° 25 amp blade fuse near the coil (feeds input 12V to both relays)
° Both Coil primary terminals
° Fuse 12, in the "pick" to the Fuel relay
° FI system ground points on the intake manifold

Also check for air/vacuum leaks that may be leaning out the cold starting fuel mixture. The underside of the AMM-to-Throttle duct is often overlooked.
--
Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Sold 5/03)
'83 Turbo 245
'76 244 (lasted only 255,000 miles)
73 142 (98K)
'71 144 (track modified--crusher bound)
New 144 from '67 to '78
Used '62 122 from '63 to '67






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