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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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HollywoodHicks1 said:
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
 

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Discussion Starter #3
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!
 

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02 eldo collectors series, 98 eldo, 97 deville, 96+94 SLS,
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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
 

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Discussion Starter #5
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.
 

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1995 Sedan De Ville (4.9 L)
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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.
 

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1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
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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.
 

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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! :tisk:
 

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02 eldo collectors series, 98 eldo, 97 deville, 96+94 SLS,
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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
 

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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
 

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CadillacJack76 said:
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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