What causes a Cadillac Seville engine to stall?
What causes a Cadillac Seville engine to stall?
Fuel pressure which is low or was normal when the engine is started, but falls off as the stall develops, can be either an electrical or a fuel system problem. To eliminate the electrical aspects, repeat the stall with the Analyzer 5-25400 in step 20 (monitor) and observe the speed sensor, fuel pump, group I and 2, and ignition ON lights.
What causes low fuel pressure in a Cadillac Seville?
A primary cause of this condition is low idle speed caused by an accumulation of deposits on the throttle valves and idle bypass passage. The idle speed should be set to 650 RPM, (600 RPM on 1975-1976 C and E)before any further diagnosis. 2. Normal fuel pressure is shown in Fig. 1.
What was the ignition switch on a 1978 Cadillac Seville?
Figure 6-1 shows inputs which govern the outputs of the Electronic Control Unit. For detailed procedures, read “Electronic Fuel Injection” in 1978 Cadillac Service Manual. With the IGNITION SWITCH in Start or Run, current flows to the DISTRIBUTOR through the PNK wire.
Where is the EFI switch on a Cadillac Seville?
– To check LEFT FRONT DOOR SWITCH, connect wire from FUSE BLOCK connector (C101, terminal M) to ground and observe indicator light. The EFI controls fuel injection and limits emissions by balancing the air/fuel mixture. NOTE: The normal engine timing advance is 10° before TDC (8° in California).
A primary cause of this condition is low idle speed caused by an accumulation of deposits on the throttle valves and idle bypass passage. The idle speed should be set to 650 RPM, (600 RPM on 1975-1976 C and E)before any further diagnosis. 2. Normal fuel pressure is shown in Fig. 1.
Fuel pressure which is low or was normal when the engine is started, but falls off as the stall develops, can be either an electrical or a fuel system problem. To eliminate the electrical aspects, repeat the stall with the Analyzer 5-25400 in step 20 (monitor) and observe the speed sensor, fuel pump, group I and 2, and ignition ON lights.
What was the circuit number for a Cadillac Seville in 1975?
Electrical and vacuum circuits for all fuel injected cars, 1975 to 1977, are presented at the back of this manual to aid diagnosis as small changes have been incorporated from year to year which often affect diagnosis. When specific circuits need investigation, reference will be made to a circuit number (807,827, etc).
How do you check the map hose on a Cadillac Seville?
To check the MAP hose, disconnect the hose at the throttle body and connect a hand vacuum pump such as 1-23738 to the hose, Develop a vacuum of 15” in the hose and check for leak down. The MAP hose should also be inspected for kinks or restrictions at the throttle body, ECU and in the harness where the nylon line passes the exhaust manifold.
