View Full Version : Delco VS Bosch Plug Wires

12-15-05, 12:07 PM
I need to replace my plug wires for my 99 DeVille, has anyone used the Bosch wires listed below...I'd like to save the $35.00 ( from autopartsgiant.com ) if these are a good choice although I've been told to stick with O.E. and has anyone dealt with this parts supplier? Thanks


12-15-05, 12:40 PM
I am running cheap-o autozone wires. For the longest time I thought this backfiring problem was due to this, but turned out it was a leaky injector. Now I have no problems at all, no radio interference, no missing, runs perfect. I may be the exception, I don't know, but I can say that you get what you pay for...

12-16-05, 01:16 PM
Thanks ElDorodo1,

How about anybody else, I was really hoping to find someone who has had experiance with Bosch wires and their thoughts on them??

12-16-05, 04:17 PM
I had a set of Bosch wires on my old '66 Mustang, but that's a completely different animal. They worked great though. I've heard of a few people having RFI problems with non-OEM wires and ending up with dead blower motors because of this. I used the OEm wires when I replaced mine so I can't tell you from personal experience. When in douobt though, stick with OEM. It may be more expensive, but at least you knwo that they have been properly tested on the car, and shoudl work perfectly. That's the draw back with using aftermarket stuff, it's pretty much trial and error until you find a set that works fine. These bosch wires might work great, or they might not. For what it's worth, their spark plugs are crap, and shouldn't be used in case you need to replace them in the future too. Just a heads up. Good Luck.

12-20-05, 01:05 AM
Hmm... on a related note, anyone know the difference between the 748J and 748Q plug wires? J is what comes up when I search for my 95 Eldo, but when I search for a 98 ETC for example it comes up with 748Q.

12-20-05, 07:16 AM
The plug wire set is different between a 1995 and a 1998 car. In '95, the left bank (front) wires were routed over the water pump area and then down the length of the cylinder head. Starting in 1996, the four wires for the left bank routed straight over the intake manifold. There is a difference in length, and a different part number.

Regarding aftermarket vs. OE, I'd stick with OE everytime. Having said that, I was in a pinch a year ago at Thanksgiving time. The dealer had just performed the fuel rail recall on my '97, and I think they damaged one or more of the wires. The wires were original, so they were getting old anyway. I think the severe handling was the last straw. Anyway, the engine was misfiring at about 1/2 throttle or more, and we were due to take a 1500-mile trip at Thanksgiving. I promptly ordered up a set of ACDelco wires from GMpartsdirect.com and after over a week of being "back ordered" and not getting any info from them, I cancelled my order and went to my local Advance Auto. I could have bought the ACDelcos for about $130, or Autolite Professionals for $65. I tried the Autolites. So far, so good. It's been about a year and 10,000 miles or so probably. The plugs are still original, and when I change those, I WILL use ACDelco, but so far, the Autolite wires are holding up fine.

I've never had good experience with Bosch parts on an American car, but haven't had their wires in particular, so I can't comment on them. I had lousy experience with O2 sensors and spark plugs from Bosch, and have generally decided against Bosch anything in the future.

12-20-05, 10:44 AM
Well I purchased the Bosh wires from "AutoZone" for $69.99 saving myself the trouble of paying S&H plus the wait time, so far so good, they seem to be fine but time will tell, I can tell the dif. in wire thickness though.