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The Classic Cadillac Forum Discussion, 1979 Seville Help Please... in Past Cadillac Vehicle Discussion; Thought I'd take a moment to give everyone an update here... Lot's of progress since last week @ Wednesday. First ...
  1. #16
    Driver-8's Avatar
    Driver-8 is offline Cadillac Owners Member
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    Re: 1979 Seville Help Please... UPDATE...

    Thought I'd take a moment to give everyone an update here...

    Lot's of progress since last week @ Wednesday.

    First regarding the Fast Idle control, in 'fiddling' around with it, a couple brittle plastic parts cracked. I was able to crazy glue them just like new, but then when twisting the heater in place, a chip flared off the side right where it retains the fragile silver arm on the unit body. So, I built my own bypass with some garage parts since it has no effect with our current weather conditions. I was able to negotiate with an ebay seller to come way down on a used unit, verified to work, (since CadillacKing wanted $220+), so when that one arrives, it will be installed along with a spacer for the brass plunger to push down on. This way, I won't have cold start issues in April, May or October before the car is 1st taken out or before storing away for winter. I obtained a couple of back up EFI air/temp sensors that test 100% at @ 1000 ohms.

    I also removed the catalytic converter and installed a tubular resonator in place last week, then installed new HD Monroe air-shocks (nice to have my ride height back Eventually, I will tear down the ELC compressor and sensor to find where the inop problem lies. For now, I have the common Schrader valve installation behind my license plate. Next on the agenda is the new timing chain and replace all flexible fuel lines/clamps underneath the car.

    A small interior thing that was driving me nuts was the worn, chipped chrome strip running across the 1979 horn pad. I used a $3 Chinese adhesive backed, flexible chrome strip from ebay in place of the original rigid plastic insert (which pops out gently with a tiny flat screwdriver), it worked! and now looks just same as new. I even have enough left over to replace it 3 more times if needed. Will also post pics of this on my Dropbox folder soon for others to see the results.

    So... took the day away from my work on Wed. to drive out and meet Bruce Roe (forum member, retired Electrical Engineer & 70s EFI specialist), 2.5 hrs from home. I was gonna take my Jeep, but decided to chance the road trip with the Seville (much more adventurous AND enjoyable!) Bruce is an amazing guy to hang with, very smart and very kind.

    The car drove quite well overall, but I still experienced that same persistent hesitation/bog when starting from any stop and/or asking for more power at cruising speeds. Well, my GPS was out on my new phone, so I got lost a couple of times out in the corn-fields, but after a phone call to Bruce, he set me on the right path and Christine and I arrived safely.

    After touring his @ 5 acre property, viewing some cars, buildings and self-sufficient solar panel installations, we removed the ECU from the Seville to bring it into the Engineer's room for testing. Nothing I had done to the car yet had resolved the hesitation/bog issue (although there was quite an improvement with a new ACCEL adjustable vacuum advance installed last week in the distributor).

    In a short time, Bruce verified what he had already suspected and indicated here on the forum thread, that, in fact... my original MAP sensor was failing. He handed me an alternate ECU for the car, I went out to the driveway, hooked it up and went for a 25 minute test drive to grab some lunch for us. Immediately upon starting and pulling out of the driveway, Christine felt like a different car. ZERO hesitation for the 1st time in ages. In addition, once on the country road, I opened her up and nothing but smooth, strong power. Another thing I had not felt in the car in such a long time.

    When I returned I gave Bruce the great news and after grabbing a bite, we went to look at my original ECU opened up. I had purchased a working 1979 Eldorado ECU off ebay and exchanged it for a backup unit for my Seville. So what we ended up doing was, installing one of Bruce custom designed/built MAP sensors into my computer. He then tested it and made some tweak adjustments. I swapped the new backup for my original with the new design MAP and am now an official real-world road tester for this modification. I promised to report back regularly with good/bad input on performance with the new chip.

    Since Wednesday, I had the 3hr + crawl home (construction and horrid traffic), and several local errands along with some cruising, the car is really running great. What a difference.

    I also bought the new wired external fuel pump relay setup from Bruce, and as I write this, Christine is out in the garage with the ECU wire harness down under the dash ready for me to solder in the new bypass.

    So now I have a modern reliable MAP sensor, a safe fuel pump relay and a backup ECU just in case. I just couldn't be happier right now, I love my Cadillac. I had a great day out at Bruce's home, learned alot about the 70's EFI ECU's and made a new quality friend on top of it.

    BTW, I also formally joined here and the CadillacLasalleClub where they are sending out my packet soon. A few random pics here, I will get some new ones after I do a much needed machine compound/cut & Mothers synthetic polish.

    Mark~ https://www.dropbox.com/sh/6qtr1acy4kdao7i/hrSPijD_PB
    Attached Images

  2. #17
    talismandave's Avatar
    talismandave is offline Cadillac Owners Master
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    Re: 1979 Seville Help Please...

    Glad to hear the good news. You can not beat the quality of people on this forum.

    Christine is a stone cold gorgeous gal! Enjoy and keep up the good work.

  3. #18
    mottati is offline Cadillac Owners Member
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    Re: 1979 Seville Help Please...

    Great thread. I just picked up a 79 Seville last night, and look forward to hearing your progress.
    Mike

  4. #19
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    Re: 1979 Seville Help Please...

    Interesting to read about the '79 Seville. I was inspired to research it because I saw one in San Francisco for sale w 59K miles. ($3900) Silver with red interior.
    They are neat cars !

    Just looked at the photo album.
    Nice color ! Man you are brave for removing the dash etc. Cool ride !

  5. #20
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    Re: 1979 Seville Help Please...

    Fun to read through it again for me too. I read about you planning to get it out of winter storage, I had to look where you were and was surprised you were so close. We should get Christine and Guido together for a play date before winter!


    I think they would make a good pair for a photo shoot!

    We would have to keep a close eye on them though. Wouldn't want a yellow Cimarron running around in 9 months!

  6. #21
    orconn's Avatar
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    Re: 1979 Seville Help Please...

    What color is your '79 Seville? It looks like Phoenician Ivory, a very pale yellow. My 1976 Seville was that color, it was perfect for California cool in the sun and yet it turned a much brighter lime yellow on grey abd rainy days,

    I bought my Seville new and owned it for eight years. To this day it is still one of my favorite cars!

  7. #22
    Driver-8's Avatar
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    Re: 1979 Seville Help Please...

    Quote Originally Posted by orconn View Post
    What color is your '79 Seville? It looks like Phoenician Ivory, a very pale yellow. My 1976 Seville was that color, it was perfect for California cool in the sun and yet it turned a much brighter lime yellow on grey abd rainy days,

    I bought my Seville new and owned it for eight years. To this day it is still one of my favorite cars!
    Hi, I would agree, and after owning 17 used and 6 new cars since I was 16yo, my Seville is in the top 3 of any of them.The Gen 1 Seville is one of the few cars that I rode around the Cadillac dealer lot on my Schwinn Stingray (Corvette Yellow , and lusted after. From the day they were released, I always wanted a Gen 1 Seville.

    1979 color #62 = Laramie Beige and is quite different from Colonial Yellow (which several 'car/Cadillac' people assumed or even insisted it was). It is a deep beige with a tinge of yellow and when contrasted with my near mint Saddle leather interior, it is just beautiful.

    seville1979paintchart.jpg

    These days, most younger people have no clue that we used to have choices of over 15 paint colors, at least 8 interior colors and then dozens of possibilities with various combos or even two-tones. I frequently hear 23-35yo say>> great car... are you gonna repaint or thought about changing the color?

    IF... and it's a BIG 'if', I ever decided to color-change, it would still be with 1979 Seville colors. I would consider solid or 2-tone (which fits the cars lines so well), in Post Road Brown and/or Western Saddle Firemist.

    As seen in a few of the pics, I have started an interior contrast project adding a very dark chocolate brown detail to the original Saddle. Everyone loves it and it looks factory (no hack-jobs allowed So far I have completed the dash, steering column, pull-straps and horn pad.

    I have begun to store the car away for winter, so I don't have any more recent progress pics. Probably not until spring now.

    https://www.dropbox.com/sh/15b6vyhqpt2zqyo/6J6e9FskOB

    As far as car colors go, sadly...all they know today is silver, white, red and black with a grey or tan interior. Different times for sure.

  8. #23
    Driver-8's Avatar
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    Re: 1979 Seville Help Please...

    Hey Dave... you didn't sell the '74 did you?

  9. #24
    Driver-8's Avatar
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    Re: 1979 Seville Help Please...

    BTW, I posted that color chip booklet for everyone to see, but given scan and our monitor variances, it is not an accurate representation of most of the colors, including mine. But thought it would be of interest for people to see it.

  10. #25
    talismandave's Avatar
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    Re: 1979 Seville Help Please...

    Quote Originally Posted by Driver-8 View Post
    Hey Dave... you didn't sell the '74 did you?
    Nope still a work in progress. Just wanted a fun driver.

  11. #26
    Driver-8's Avatar
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    Re: 1979 Seville Help Please...

    Quote Originally Posted by talismandave View Post
    Nope still a work in progress. Just wanted a fun driver.
    Well, you def have that! Man... I love the leather interior on that car, design and color. One of my fav touches is the embroidered wreaths.

  12. #27
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    Re: 1979 Seville Help Please...

    That, and the color were the driving forces behind my buying a third car, I didn't need. I love old Cadillacs in the pastel colors!

  13. #28
    Festus40 is offline Cadillac Owners Member
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    Re: 1979 Seville Help Please...

    Early Seville Owners, I once owned a 1978 grey moonroof version. Had it about 4 months and drove it back and forth about 60 miles per day. As the weather cooled a problem developed. Outside air temp below 60F, after driving about 10 minutes, the engine would just shut down. Pulled over to outside shoulder and waited. Tapped on case of ECU located below center of dash. After about 5 minutes, engine would start and run good the rest of the day. Being an electronic nut, I removed cover and started to troubleshoot the ECU board. When temp was below 60f, one of the custom IC's would drop out UNTIL I would heat it up with my wife's hairdryer. Tried to find a replacement IC, but no luck. Contacted a local supplier for a used ECU and swapped it out..No more problems..Until my wife had another driver pull across in front of her going 50 mph. End of my Seville. She broke her nose on the top of that hard plastic steering wheel, but the seat belt kept her in the car. All this occurred after spending $1500 for a new fabric top and Emron grey metallic paint. Oh, well, I still have my wife, Thanks to the One who watches over all.
    talismandave likes this.

  14. #29
    althegut is offline Cadillac Owners Member
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    Re: 1979 Seville Help Please...

    King cadi Calif ask for Tom

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