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1984 633CSi Rises again!

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songzunhuang
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Re: 1984 633CSi Rises again!

Post by songzunhuang » Thu Oct 12, 2017 3:20 pm

hornhospital wrote:
Thu Oct 12, 2017 12:28 am
Have you ever tried a new set of OEM Bosch plugs, the WR-9-LS?

I normally prefer NGKs, but my 633 seems to run better on the Bosch plugs.
Have not tried Bosch on the e24. I have tried them in other cars.

The e24 has idled perfectly before which leads me to think it’s not plugs. The rough idle at start is a pretty recent development so something must have gone bad. Vacuum leak was my first hunch, but now that I’ve gone through all the hoses for the idle circuit, it doesn’t look like that’s the issue.

I’ve read of the Temp sensor, O2 sensor and a few other things to try, but as usual I am hoping to gain the collective wisdom of bigcoupe in hopes I can reduce the experimentation period!
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Song Huang
1984 633CSi
Last 7 of VIN: 6997383

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raykoke
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Re: 1984 633CSi Rises again!

Post by raykoke » Thu Oct 12, 2017 5:23 pm

I'd try a valve adjustment and an Italian tuneup first :)

I try Italian tuneups frequently. I don't know if they help, but I feel better :D

Your rotor and distributor cap are good, right?

I'd look at injector spray patterns after. Or maybe put some Lucas injector cleaner through, or Techron.

Cheers,

Ray
'85 ///M635

songzunhuang
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Phantom Coolant leak

Post by songzunhuang » Tue Oct 17, 2017 1:19 am

So in the past weeks, my car is losing about 1-2 cups of coolant every 40 miles. I can't clearly see any moisture or leaks most of the time, but every once in a while I spot something that could be a leak. It must be so slow as to evaporate on contact with the hot engine. As a result, I am systematically replacing all the hoses that are suspect. This weekend as I was scratching my head, I spotted a hose that I hadn't considered before. The is the hose along the firewall from the heater valve to the engine. I hadn't considered it because there's never been any evidence of moisture from that area. That didn't stop me!

I decided to use some really high-quality silicon hose that I happened to have lying about from another project. It wasn't until after I installed it that I realized it didn't look stock. LOL! Oh well, it's in there now and when my other hoses arrive (hopefully today), I will have eliminated all old or suspect hoses.
Screen Shot 2017-10-16 at 6.11.39 PM.png
Great hose but not OEM looking. Oh well.
Screen Shot 2017-10-16 at 6.11.39 PM.png (781.26 KiB) Viewed 104 times
At this point I am looking for function first, then I'll worry about appearances later. Meanwhile, I am sad to report that this fixed nothing. This morning after my commute to work, I was 2 cups low again. Argg. ](*,)
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Song Huang
1984 633CSi
Last 7 of VIN: 6997383

songzunhuang
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Re: 1984 633CSi Rises again!

Post by songzunhuang » Tue Oct 17, 2017 1:22 am

raykoke wrote:
Thu Oct 12, 2017 5:23 pm
I'd try a valve adjustment and an Italian tuneup first :)

I try Italian tuneups frequently. I don't know if they help, but I feel better :D

Your rotor and distributor cap are good, right?

I'd look at injector spray patterns after. Or maybe put some Lucas injector cleaner through, or Techron.

Cheers,

Ray
Haha, I had to look up the Italian tuneup. OK, done. Valve adjustment will have to wait until a day I have more time. I did do one about a year ago.

Rotor and distributor have been replaced about 1.5 years ago. I guess I can check again when I have time.

Injector cleaner can't hurt. That's now on the list.
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Song Huang
1984 633CSi
Last 7 of VIN: 6997383

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raykoke
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Re: 1984 633CSi Rises again!

Post by raykoke » Tue Oct 17, 2017 2:21 am

How are you measuring the coolant leak?

Um, the exhaust does not smell sweet, does it? :)

If you let it go further (days), does more coolant escape? I mean, it's not just seeking a lower level than you anticipate, right?

Good luck,

Ray
'85 ///M635

songzunhuang
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Re: 1984 633CSi Rises again!

Post by songzunhuang » Tue Oct 17, 2017 4:47 am

raykoke wrote:
Tue Oct 17, 2017 2:21 am
How are you measuring the coolant leak?

Um, the exhaust does not smell sweet, does it? :)

If you let it go further (days), does more coolant escape? I mean, it's not just seeking a lower level than you anticipate, right?

Good luck,

Ray
No, the exhaust doesn't smell sweet (aka a head gasket leak). Also there is no puff entering into the cabin (heater core leak).

As for whether it is seeking a lower level, I have filled the expansion tank every time I drive it for almost 2 weeks now. It's consumed easily 1 gallon of coolant/water about 2 -4 cups at a time. It does lose more when I drive more. After about 1 hour of driving, the low coolant light will come one. It's definitely going at a pretty regular rate, I just can't figure out exactly where!

I do see traces of dried coolant on the front of the oil pan with streaks going back, indicating that wind is blowing it back. I can only guess this is coming down from the mess of hoses at the thermostat and water pump area. That's why I've pulled that apart twice and reseated the hoses. I am now awaiting the arrival of 2 new OEM hoses to replace some aftermarket hoses, although I don't see definitive evidence of the aftermarket hoses leaking either. So you see why this has become a total head-scratcher.
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Song Huang
1984 633CSi
Last 7 of VIN: 6997383

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hornhospital
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Re: 1984 633CSi Rises again!

Post by hornhospital » Tue Oct 17, 2017 5:48 am

You could take a giant step toward finding coolant leaks by using a pressure tester on the system. Super simple to use, it'll point out leaks where you never suspected there were any before. And it's done cold, so no chance of getting scalded if something lets go.
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'87 325is "Odette"; '93 325is "Elvira"

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TBM
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Re: 1984 633CSi Rises again!

Post by TBM » Tue Oct 17, 2017 2:11 pm

Song,

If you have the OEM radiator with the crimped tanks that is a prime suspect as well. I had a really good radiator shop take mine apart check the internals and crimp it back.
'84 M635csi
'86 Lotus esprit Turbo (sold)

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TBM
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Re: 1984 633CSi Rises again!

Post by TBM » Tue Oct 17, 2017 2:20 pm

[/quote]

Haha, I had to look up the Italian tuneup. OK, done. Valve adjustment will have to wait until a day I have more time. I did do one about a year ago.

Rotor and distributor have been replaced about 1.5 years ago. I guess I can check again when I have time.

Injector cleaner can't hurt. That's now on the list.
[/quote]

Replacing injectors is not a bad idea either way. Think about the amount of years they have been working. Reaction time and spray patterns on the new injectors would be superior. http://www.bimmerworld.com/BMW-Parts/BM ... 73272.html
'84 M635csi
'86 Lotus esprit Turbo (sold)

songzunhuang
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Re: 1984 633CSi Rises again!

Post by songzunhuang » Tue Oct 17, 2017 10:20 pm

TBM wrote:
Tue Oct 17, 2017 2:11 pm
Song,

If you have the OEM radiator with the crimped tanks that is a prime suspect as well. I had a really good radiator shop take mine apart check the internals and crimp it back.
Radiator was replaced with a Nissen unit the first week I got the car. That’s just over 2 years ago. I’ll keep an eye out, but it’s low on the suspect list.
Last edited by songzunhuang on Tue Oct 17, 2017 10:21 pm, edited 1 time in total.
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Song Huang
1984 633CSi
Last 7 of VIN: 6997383

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sansouci
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Re: 1984 633CSi Rises again!

Post by sansouci » Wed Oct 18, 2017 6:29 pm

Song,
I don't know if you park inside a garage, but the $12 drip pan from Walmart is helpful in keeping things tidy as well as trying to locate leaks:

Product TitleATP Large Oil Drip Pan
Average rating:4.4118out of5stars, based on51reviews(51)ratings
Price
$11.97
Pickup Only
Show only ATP items
Product Spec
Galvanized steelMany usesBiggest drip pan available
FREE PICKUP TODAY

Also, from your pic, the bottom hose clamp on the old fat one doesn't look like it's in the right place.
Sansouci
84 E24 633Csi Auto, Bronzit/PearlBeige 6997510
93 E32 740il M60 Auto, Alpenweis/Ultramarine
60 535i M30 5-speed Green/Beige (crushed)
71 240Z 4-speed White/Blue (rusty & sold)
65 396 Chevelle 4-speed, Marina Blue/Black (stolen)

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86_6series
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Re: 1984 633CSi Rises again!

Post by 86_6series » Thu Oct 19, 2017 12:30 pm

+1 on the pressure tester.
Eliminates the guesswork.

songzunhuang
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Re: 1984 633CSi Rises again!

Post by songzunhuang » Thu Oct 19, 2017 5:08 pm

sansouci wrote:
Wed Oct 18, 2017 6:29 pm
Song,
I don't know if you park inside a garage, but the $12 drip pan from Walmart is helpful in keeping things tidy as well as trying to locate leaks:

Product TitleATP Large Oil Drip Pan
Average rating:4.4118out of5stars, based on51reviews(51)ratings
Price
$11.97
Pickup Only
Show only ATP items
Product Spec
Galvanized steelMany usesBiggest drip pan available
FREE PICKUP TODAY

Also, from your pic, the bottom hose clamp on the old fat one doesn't look like it's in the right place.
The car is outside. I can see little spots in our dyed concrete driveway, much to the alarm of my wife. These little spots are inconclusive. They are small and all over the place! Lol.

Today, I had to turn around and go back home as the car puked up a ton of coolant after the temp warning light lit up! I actually removed the thermostat housing and checked the thermostat on the the side of the road. It looked fine. Luckily for me, I pulled over at a Caltrain staging area so there was a porta potty with a hand wash station. That station had gallons of water. 😏 I used some to refill the coolant and drive home.

So, this weekend I’ll get to replace hoses and check the cooling system again. Sigh - so annoying.

Finally, your comment on a picture where the hose seems to be in the wrong place? I can’t resolve that comment with what I see. I didn’t swap any hose placements and I’ve driven the car for thousands of miles in the current hose configuration. I’d be surprised if it was totally wrong.
-----
Song Huang
1984 633CSi
Last 7 of VIN: 6997383

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hornhospital
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Re: 1984 633CSi Rises again!

Post by hornhospital » Thu Oct 19, 2017 7:45 pm

songzunhuang wrote:
Thu Oct 19, 2017 5:08 pm

Finally, your comment on a picture where the hose seems to be in the wrong place? I can’t resolve that comment with what I see. I didn’t swap any hose placements and I’ve driven the car for thousands of miles in the current hose configuration. I’d be surprised if it was totally wrong.
Song, he said the hose CLAMP appeared to be in the wrong place, not the hose. Your center photo shows the clamp well off the large end of the hose. It should be where the second line is in this edited shot, unless that's some sort of boot over the hose. ???.
Attachments
Hose clamp.JPG
Hose clamp.JPG (43.79 KiB) Viewed 12 times
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'87 325is "Odette"; '93 325is "Elvira"

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