[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
On 4 Feb 2005 at 10:12, Everett Barnes wrote: > > I don't think the Bentley shows them, but they might be in the info column > in the FI system check list. Bosch just gives 3 resistances at each of 3 > temps for each sensor. > > > Where is this check list? I did find a value of 2500 ohms in the listing > for using the FI tester box on the head temp. sensor. There is no outside > temperature correlation. Troubleshooting charts b and c are as close as the Bentley gets. Here's the Bosch data: Cylinder head temperature sensor Bosch calls this Temperature Sensor II Bentley calls this temperature sensor I 7 kOhm to 12 kOhm at -10C (+14F) 2 kOhm to 3 kOhm at +20C (+68F) 680 Ohms to 1.0 kOhms at +50C (+122F) Intake manifold (or case) temperature sensor Bosch calls this Temperature Sensor I Bentley calls this temperature sensor II 860 Ohms to 1200 Ohms at -10C (+14F) 260 Ohms to 340 Ohms at +20C (+68F) 90 Ohms to 130 Ohms at +50C (+122F) I think they are generally fine as long as they are neither shorted nor open (neither 0 nor infinite Ohms.) > All 4 are firing according to my timing light and a visual check. Verify by pulling SP wires from the dist cap one at a time. It's also useful to pull injector plugs one at a time, too. If pulling a SP wire slows down the engine, but pulling an injector plug does not, then you have a leaky injector. (Be careful pulling injector plugs; don't pull on the wires.) > > Make sure that the pressure sensor hose is attached at both ends. > > > It's is. The hose is older but I trimmed the ends so they are tight. I did > notice the adjustment screw is not sealed so hopefully no one adjusted it. The hose is probably fine, but I would assume that the PS has been tampered with. Since you found that the pressure was low, I would guess that someone tried to adjust both things in an attempt to get it to run. I believe turning the adj screw CW should make the mixture leaner. Just turn it a half turn at a time; I don't think you have anything to lose. On that topic, I still plan to set up to recalibrate these. One of our listees has offered to send me one 4-pin connector body, which I haven't received yet, but I still need a second one. Anyone else got a junk one lying around? > From reading posts in the archives, it sounds like the head temp. sensor > makes the mixture richer only when the resistance is higher. So if mine is > too low, the car should not be running rich and/or wasting fuel? That sounds right to me. While other people claim to have replaced many of these over the years, I don't think I've ever replaced one unless it was mechanically damaged. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~