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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Bosch in Past Cadillac Vehicle Discussion; It's tune up time for the 90 DeVille. This is the first tune up since I had the car. I ...
  1. #1
    HollywoodHicks1's Avatar
    HollywoodHicks1 is offline Cadillac Owners Fanatic
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    Question Bosch

    It's tune up time for the 90 DeVille. This is the first tune up since I had the car. I want to know if Bosch products are any good on this particular car. I've heard many different opinions about how they make the car act. I got the spark plugs and the oxygen sensor. The guy recommended that I get the Bosch Platinum plugs over the AC Delco because they were better. They were priced the same, but what do you all think about this?

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  3. #2
    dave383 is offline Cadillac Owners Member
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    Re: Bosch

    Quote Originally Posted by HollywoodHicks1
    It's tune up time for the 90 DeVille. This is the first tune up since I had the car. I want to know if Bosch products are any good on this particular car. I've heard many different opinions about how they make the car act. I got the spark plugs and the oxygen sensor. The guy recommended that I get the Bosch Platinum plugs over the AC Delco because they were better. They were priced the same, but what do you all think about this?
    I'd stick with the Ac/Delco and if u can spent the extra money i would
    get the rapid fire plugs. i put the bosch Platinum 4 plugs on my 94 Cavalier, and they made my car miss fire cause u couldn't gap the plugs correctly. that was my experience with bosch plstinum 4 plugs. the reason i like the ac delco is cause they are made by GM. My 2 cents

  4. #3
    HollywoodHicks1's Avatar
    HollywoodHicks1 is offline Cadillac Owners Fanatic
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    Re: Bosch

    Man that is what I was gonna do in the first place. I wanted to get those Rapidfire ones, but the guy gave me every reason in the world to get the Bosch. I didn't argue with him because (1) he knows more than I do and (2) they were priced the same. Thanks for the help!

  5. #4
    CadillacJack76's Avatar
    CadillacJack76 is offline Cadillac Owners Fanatic
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    Re: Bosch

    I own a 90 deville, it has 198,000 miles on it and has always been meticulously maintained and I have been running Bosch plugs in it for ever and have never had a problem with it, it still gets great mileage and runs smooth (for a 90 4.5)


    Jack

  6. #5
    HollywoodHicks1's Avatar
    HollywoodHicks1 is offline Cadillac Owners Fanatic
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    Re: Bosch

    Alright Jack. You just slightly have a few more miles than I do, and if they work with you, I'll take a risk and see how they come along. I'll just keep the plugs and put them in. Thanks a lot.

  7. #6
    100
    100 is offline Cadillac Owners Enthusiast
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    Re: Bosch

    I had AC Delco Pt plugs in my 4.9 L when I bought the car.
    They were there for 20K miles according to the previous owner.
    I believe they are supposed to be good for 100K or so, but
    some of them looked already worn, although the car was
    running fine. So, I chenged to Bosch Pt plugs, which are the
    conventional, one electrode type. Maybe I am not too sensitive
    (My nose is very sensitive, though), so I didn't feel any
    change in performance, but I DID notice that the car starts
    better.

  8. #7
    brougham is offline Cadillac Owners Master
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    What I don't like about the AC delco sparkplugs is that the washers don't stay on them like most plugs. But I don't know if those engines use the plugs with the washers or not. I think that would probably be even worse on those enignes when you can't even see the back.

  9. #8
    Ralph's Avatar
    Ralph is offline Cadillac Owners 10000+ Posts
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    I put in the Bosch plats (not 2 or 4's) one month ago. It runs great, but I notice slightly less mileage. It might be due to the fact it is getting colder, and dense air tends to burn more. Don't ask me to repeat the words I used getting the last two plugs out on firewall/passenger side!

  10. #9
    CadillacJack76's Avatar
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    Re: Bosch

    No problem, I am glad I could help, if you have anymore questions about your 90 lemme know, I have owned mine since 92 and seen a few problems!

    Jack

  11. #10
    CadillacJack76's Avatar
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    Re: Bosch

    Hey, did you try getting to those plugs you were talking about from the bottom using about a 1 1/2 or 2 foot extension with a universal on it? Thats the way I always do mine and I get 3 from the bottom and then the 1 behind the tranny dipstick from the top without an extension just a universal.

    Jack

  12. #11
    Ralph's Avatar
    Ralph is offline Cadillac Owners 10000+ Posts
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    Re: Bosch

    Quote Originally Posted by CadillacJack76
    Hey, did you try getting to those plugs you were talking about from the bottom using about a 1 1/2 or 2 foot extension with a universal on it? Thats the way I always do mine and I get 3 from the bottom and then the 1 behind the tranny dipstick from the top without an extension just a universal.

    Jack
    Nope, from the top. I don't know how it would have worked from the bottom, due to the angle of the plugs, etc. I did have to flex the hell out of the heater hose that practically runs the length of the firewall. What ever works I guess.

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