LACK OF POWER, SLUGGISH OR SPONGY
(continued)
CHECK SENSORS AND CONTROLS FOR:
1.
Possible open in Engine Coolant Temperature (ECT) and Manifold Absolute Pressure (MAP)
sensors (Ground CKT 814). Also could have and set a DTC 14 and/or 33.
2.
3.
Throttle Position (TP) sensor circuit if DTC 21 set for open or grounds.
Using a scan tool and/or voltmeter record Throttle Position (TP) sensor voltage. It should read
less than .7 volt with throttle closed or at idle position. A sticky throttle shaft or binding linkage
causes a high voltage
4.
5.
Power reduction mode activated.
Diagnostic test CKT 451 for being grounded, (maximum RPMs be will lower).
CHECK ENGINE FOR:
1.
2.
3.
Restricted exhaust system.
Proper cylinder compression.
Proper valve timing and worn camshaft.
ADDITIONAL CHECKS:
1.
2.
3.
4.
Proper alternator output voltage..
Clean, tight and properly located ECM grounds.
Excessive resistance on bottom of boat (dirt, barnacles, etc.).
Proper size and pitch propeller for application.
Index
5C-126 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you