Hi F456, CharlieA. F456, have you had a chance to dial in your timing on your "new" QP3? I wonder what setting you arrived at, and also if you've measured Jarle's to determine how his is set up (especially seeing as how his seems to be running really, really well). Is his microswitch active/connected? How much advance is his car running? I'm going to have a new go at carb tuning + timing next weekend. The car starts and runs fine, but uses a lot of gas (about 0.2l/km or 12mpg, which is worse than it was when I started ). It also idles higher in P & N than when in gear, noticeably so. Based on consumption and the fact that the Colortune showed irregular combustion when I tried it previously, I think I need to check both the timing (to show consistent combustion across all cylinder at both idle and higher revs) and the carbs idle setting (to get the ideal gas/air mixture in each cylinder). Thanks for any experiences you can share that might help us arrive at a good setting. Looking forward to seeing some more pictures of your car.
showed up Sat.! I have not looked at anything but photo. headed to Vanderbilt. possible bone morrow tomorrow
Any ideas out there on what to replace that Bosch electronic box in the ignition circuit with on a Quattroporte III. My car was running fine and then just died in traffic without warning. I have tried a different coil, but there's just no spark at all. I suspect that Bosch box but no-one hear knows anything about them and I see a new one from MIE is more than $400, which is a bit much for a gamble. I was wondering if anyone on here has tried an upgrade to something more modern?
If you trust the service manual, it's a Bosch 0227 100 008. They seem to be readily available: BOSCH 0 227 100 008 (0227100008) Ignition Switch Porsche 928 Bosch Ignition Control Computer Unit CDI 0227100008 | eBay Porsche 928 CDI Box Bosch 0227100008, 0 227 100 008 - Specialized ECU Repair https://dragtimes.com/parts/Porsche-928-Bosch-Ignition-Control-Computer-Unit-CDI-0227100008_151148534411.html Delivered as standard in a range of BMWs, Lancias and the Porsche 928. Hope this helps.
Gents A quick question. What do you think in time or cost it would take to do the following: Change the steering rack, tie rod ends and ball joints and Change the rear shocks. Thanks
Just a quick update, went back to check the timing and carb setup with a mechanic friend today. We went through the entire vacuum system and found that the solenoid closest to the firewall was not working. It wasn't open or closed, but something in between and didn't switch at all. I wonder if this solenoid is operated by the microswitch under carb no. 1? Anyway, we bypassed the solenoid completely and connected the vacuum line directly to the rest of the system. The idle changed instantly (for the better) and the motor purrs like a kitten now. Lack of vacuum advance appears to be the culprit for the rough running and missing combustion. Hooked the Colortune up and went cylinder to cylinder - lo and behold we can see combustion now in all cylinders. Nice. Most of them were pretty close, but 2 were way off and one needed some adjusting. Can't wait to get my new dampers back and go for a drive...!
Quattroporte3... Excellent work... Interesting regarding the solenoid by the firewall.. I think in my thread I asked about these as well.. Can't remember if I ever got an answer... But your post sheds some new light on the subject.. Where exactly and how did you connect this vacuum line to the rest of the system.. Does anybody have a good vacuum diagram for these cars? Mike
Congrats There's always a solution you know! I'm on 9500 kmtrs since november, car still runs like a champ! Later this spring it will get some TLC and some small things fixed. But all in all, the car has been dead reliable and a joy to drive.
Hi Mike, the vacuum diagram is on the car itself, on the right side fender well under the hood. It's pretty simple (not that I claim to understand it myself!). There's a tee that goes to the solenoid and allows it to switch in/out of the circuit, we simply pulled the tube off and connected it directly, bypassing the solenoid. I don't recall offhand if it went to the vacuum tank or the charcoal canister, but if you follow the tubing you'll find it. I can post a pic or two later tonight.
Thanks! I wondered if you know how much timing advance your car is running, since it seems to be running particularly well. Could you tell us all what it's set at?
Here are a few pics. First you see two vacuum lines going to the solenoid, one with a tee that splits it into the cabin (?). The line with the tee goes to the distributor advance mechanism, the other either to the charcoal canister or vacuum tank, I don't remember exactly. Both are on the left side of the car, if you follow the tube you'll figure out which, but it doesn't really matter, because all you need to do is bypass the solenoid. The second shows how we pulled both tubes off the solenoid and connected them directly to each other, bypassing the solenoid. The part that comes off the tee into the cabin(?) is left as is, and the short stub that connected the tee to the solenoid I've put in the glove box for later. As far as I can tell, the solenoid opens/closes the vacuum to the distributor advance depending on either the position of the microswitch or temperature of the motor, or both. I probably should look into it, there are 2 electrical wires hanging off the solenoid. Hope this is clear enough. Image Unavailable, Please Login Image Unavailable, Please Login
The Cabin(?) hose goes to the Consumption Gauge. That's all I can add to this as my car only has the distributor retard/advance actuator solenoid. Tony
Is your car a US or EU spec one? The manual (chapter 4) shows the entire anti-pollution system. I don't have the addendum for different model years handy, but do EU spec cars have any anti-smog stuff at all on the engines? F.x. is there an air pump? I know there aren't any charcoal canisters, but are there valves on the air box trumpets that close when the engine is cold and open as it warms up? Interesting.
1979 EU spec. It had an air pump. I removed it so long ago I forgot about that. But that's it. No valves on the trumpets. No cats. Tony
Hello Quattroporte3/Tony... I suspect the vacuum systems on some of these cars may be somewhat different from car to car. This could be due to the US vs Euro car differences and then year to year... I took a quick look at my solenoids, and interestingly one is different than the other.. Also the line that tee's off on mine goes to the climate system, probably for the push buttons.. I will have to check and see how my consumption gauge is hooked up... I did take some more pictures and will be posting them on my 1982 QPIII thread hopefully tomorrow... Mike
I'm sure they are different car to car / year to year. My car has manual HVAC controls (3 big round dials on the dash) Some have vacuum activated controls (push buttons). Tony
Thanks for jogging my memory. The tee off the solenoid/distributor/charcoal canister in the picture goes to the HVAC system, not the consumption gauge. The consumption gauge is run off of the manifold vacuum lines. There are hoses at front and rear forming a loop (probably connected with some of the other stuff there too, I'm not at the car right now) and with a tee there too - that tee is the one that feeds the consumption gauge. My car has the push buttons AirCon/heating system. I prefer the look of the round dial controls, they seem more modern to me, but I wasn't aware that they were manual controls.
Well, to be honest, no I am planning to do a checkup this spring\early summer. But first when my 2.24v is ready for use. Then I will check the synch, mixture and also where it is at regarding timing.
Thanks man, it will be interesting to compare notes! Got my dampers back today, going to put them back on the car this weekend and go for a spin, pretty excited to see if the tuning and tweaking we've done has paid off...
Cool, looking forward to hearing your results! Finished up painting one lower side on my 2.24v today. Waiting for tons of bits for my 2.24v next week.
