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Car Forum / Porsche / Porshe 944 / June 2008engine oil warning lamp behavior
confused by this behavior - specifically, the engine oil warning lamp : start car. all checks OK, i.e. engine oil warning lamp lights up, then turns off in 1-2 seconds. if i drive < 1 mile, turn off, then restart within a few minutes, engine oil warning lamp remains lit. check oil, seems OK (vide infra). turn off, restart, same thing. if i drive > 20 miles, turn off, then restart, engine oil warning lamp lights, then turns off in 1-2 seconds. ... if the oil heats up and expands, wouldn't the oil level (i presume to be the trigger) increase and if anything shut the lamp off? why the inconsistent warnings depending on the time (i.e. distance) the engine is on? and i gather that the lamp only stays lit after the checks, i.e. it doesn't turn on when the oil goes low while the engine is on... right? its not as simple as that, but that's the basic idea, so i figured i'd post the observations i know for sure. thanks for any help! -bryan The question you need to answer is what is the engine oil pressure. If the light is correct you may have a major problem. Either you or a mechanic needs to check the oil pressure. You could ruin the engine. > confused by this behavior - specifically, the engine oil warning > lamp : > > start car. all checks OK, i.e. engine oil warning lamp lights up, > then turns off in 1-2 seconds. ignore the lamp, what does the gauge say? remember the oil pump is driven by a gear that is held in place by the bolt that holds the harmonic balancer to the front of the crank - if someone worked on the front seal and didn't tighten the bolt properly, you will have low oil pressure (DAMHIKT) ** Posted from http://www.teranews.com ** > confused by this behavior - specifically, the engine oil warning > lamp : > ... if the oil heats up and expands, wouldn't the oil level (i presume > to be the trigger) As the others have mentioned, the oil warning lamp is not triggered by oil *level*, it's triggered by the oil *pressure* On Jun 9, 2:02 pm, alordofch...@yahoo.com wrote: > As the others have mentioned, the oil warning lamp is not triggered by > oil *level*, it's triggered by the oil *pressure* Apparently, I'm an idiot ;-) Just learned that some later 944s do have a low-oil level sensor; apparently showed up around '88 ? Darthpup : > The question you need to answer is what is the engine oil pressure. William Noble : > ignore the lamp, what does the gauge say? right right right ... ok, basically, i don't know - maybe it was normal - vide infra : i just replaced the know-to-be-broken (not by me) oil pressure sender. was a VDO, the ground post was broken off, but i still had the wires connected. the VDO has a wire running up the inside of the post, that terminates in solder. the ground wire was attached, but effectively out of circuit. the oil gauge was pegged at 5 (read : broken sender). everything was stable this way for many miles, until recently. anyways, put an FAE sender in (cheaper - not sure why), drove around a bit, none of the unusual behavior was observed. pressure went from 5 bar at start to about 2-3 after a while, and went up / dn w/ acceleration - i.e. ostensibly OK. it might be a while before i see the warning behavior noted above. noticed the oil cooler housing threads for the sender were definitely worn, but still it got on there ok and is tight, and reversible (up to the point where i put it on tight). about the sending units : i bought the VDO from pelican, i liked it, but lost the ground nut for it from bumping while driving around - they are pretty nice, a plastic-sheathed metal nut. i could not get the exact replacement. had to scrounge for a nut that sorta worked for a while til someone broke it (not me). any hints how to get the nuts for the VDO would be nice. also - seems repairable - could put a bunch of solder on the post, then make sure a nut goes on - anyone try that already? the FAE sender has spaded tabs on both posts, and one is 7mm (expected), the other 8mm. so you can't put the non-spaded wire around that post. on the VDO, both are 7mm without tabs. its the right post and all, but isn't a lock-washered connection better than spaded? if you try it it is tedious getting the tabs positioned so they don't bump some brake line or the sender itself, depending how far you screwed it in. also where do the sender wires end up? wondering if one day they need replacement, or the termini get mangled and need a refreshing... -bryan > Darthpup : >> The question you need to answer is what is the engine oil pressure. [quoted text clipped - 9 lines] > pegged at 5 (read : broken sender). everything was stable this way > for many miles, until recently. 1. there is NO ground wire going to that sensor. On your car, ground wires are BROWN only. the wires are 1. light, 2. pressure, if I remember right. 2. a prior thread provided a link to a downloadable manual - you need to download it, that will answer your question as to where the wires go. 3. yes you can repair them, but you need to know how to solder and what fluxes to use or you won't be happy 4. threads are standard metric threads, just buy a matching nut. One contact has a spade lug on it, the other does not - this is to keep you from swapping the wires. 5. check ground connection from firewall to engine ** Posted from http://www.teranews.com ** |
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