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Yes, well, no Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 25 May 2001 08:18:49
In Reply to: FI system malfunction, Ken C., Thu, 24 May 2001 22:32:53 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The common term for any backup system with reduced performance is 'limp home'. However, the 'limp home' that everybody talks about is associated with the TCS (Traction Control System) that's not on your '88. When the TCS limp home kicks in, you get a major performance reduction - most folks would aspire to limp; more like crawl home.
The FI system in your '88, like most systems, have lots of sensors. The FI computer is constantly checking the health of those sensors. If it detects what it thinks is a bad sensor, it will ignore the signal, and 'accomodate' for it. For example, if it thinks the engine temperature sensor is bad, it will assume a value for the sensor and keep going. The difference in fuel schedules between a warm and cold engine aren't a lot - the most you might see is slightly reduced fuel mileage.
Quite often the effect of compensating for this bad sensor is so minor, you don't even notice the performance difference. It's there, but not like the car loses 50 hp or can't go up hill. That's why there is a check engine light; the FI computer can do such a good job of compensating for a few bad sensors, that unless it tells you to get the car serviced, you won't.
Of course, some sensors are critical to keeping the engine running, but not all. That's the 'backup mode' mentioned in the '88 manual means.
, Fri, 25 May 2001 08:18:49 <-- Viewing This Message, Fri, 25 May 2001 15:26:09
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