Car starts fine and runs fast idle until initial warm up, then the idle goes into a search mode (up then down) until fully warmed up. Upon complete warm up the car runs fine. All vacuum hoses have been replaced and are hooked up. Any ideals on where i should look next?
Thanks
Full Version: Cold Idle Issue
QUOTE(Ken Mikos @ May 4 2021, 08:14 AM) 
Car starts fine and runs fast idle until initial warm up, then the idle goes into a search mode (up then down) until fully warmed up. Upon complete warm up the car runs fine. All vacuum hoses have been replaced and are hooked up. Any ideals on where i should look next?
Thanks
Year and engine size? D-Jet or L-Jet?
This all makes a difference in troubleshooting.
1973 1.7 FI D-Jet
Sounds like a vacuum leak issue. Or maybe a problem with the decel valve.
Disconnect the decel valve, plug the hoses and retest.
Clay
Disconnect the decel valve, plug the hoses and retest.
Clay
From Anders' D-Jet Parts Analysis and Troubleshooting page...
Areas to check:
1. Intake runner-to-head gasket/spacer
2. Injector seals
3. Intake runner boots
4. Air plenum (e.g. cracks or rust holes)
5. Throttle body gasket
6. Throttle body shaft (worn body or shaft)
7. Distributor vacuum adv/ret cell
8. Auxiliary air regulator (stuck open or leaky)
9. Deceleration valve
10. Manifold pressure sensor
11. Vacuum hose cracks
12. Cold-start valve gasket to plenum
Areas to check:
1. Intake runner-to-head gasket/spacer
2. Injector seals
3. Intake runner boots
4. Air plenum (e.g. cracks or rust holes)
5. Throttle body gasket
6. Throttle body shaft (worn body or shaft)
7. Distributor vacuum adv/ret cell
8. Auxiliary air regulator (stuck open or leaky)
9. Deceleration valve
10. Manifold pressure sensor
11. Vacuum hose cracks
12. Cold-start valve gasket to plenum
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