Lol .. yes But ive given it tune ups with both stock and high performance and high performance wins in any vehicle let alone this one. and if that was the case optimum results lol. they build the vehicle to the specs of a marketing and accounting department. Whats best for the company over customer. otherwise they would all come with KnN intakes the ram heads etc.. and there wouldnt be any plastic on the newwer cheaper cars of today. and they wouldnt of come with the dana 35 they would of come with ford 8.8 or atleast dana 44s. so that arguement is shot to hell. Not to mention the np249 swap arguement.vc problems. And the awful alarms we all have to dissactivate. And if they where thinkiing of optimum results they would have direct ignition systems. way more hp and gas mileage. Not to mention the cost of replaceing wires and coils over the years. The cheap heat sheilds. and on your 98 the electric fan motor. the ford taurus fan motor is a big improvment and more reliable. but again the subject is.....
"Mods" are not always better. Truthfully a stock ignition system in top shape is all an engine with stock internals needs. High performance ignition systems exist because modified engines with higher redline and higher cylinder pressures have conditions that make it harder for the plug to fire. Your engine is stock internally so you're not going to see much if any gain using fancy coils or wires that come with zoomy looking stickers
I put high output coils on most of my engines, even the stock ones. But do so because it makes them less prone to flooding when things go wrong or it's ten degrees below zero and the fuel is fussy about igniting. They don't do anything for mileage or power over a properly functioning stock coil. That's the truth.
Multi-spark systems will do something for part throttle power & efficiency but not a lot on a fuel injected engine. They excel with carbureted stuff that has inferior fuel atomization. And you're not going to see much if any gain WOT on a stock engine unless the engine has a mixture problem. The downside of a multi-spark system is they're not as reliable as a stock ignition system. And they're pricey.
Just a few thoughts from somebody that's been there. Others will probably disagree.
PS, the parts on are grand cherokees are chosen for a lot of reasons. Like if they came with dana 60/70 axles we'd all be making 2mpg less, the truck would ride rougher, accelerate slower, and have a higher sticker price. Your bigger is better philosophy just doesn't work when designing vehicles, weight and parasitic loss are the enemy, even if cost is thrown out the window.
Im not trying to argue im just sayying for the use im useing the vehicle. Im not trying to say your car is a peice of crap or anything. I have noticed a big differnce between stock and bosch plat+4. but if yours is stock what are you getting for gas mileage? and foundry dude I always appreciate your advise youve helped me out alot in the past when I was stumped. But what has everyone tried and what are your results? Im just trying to figure out where I want to go from here. And I always like to be prepared for though s 20 bellow nights or when you car overheats or crap happens underwater kinna scenarios. Im sorry for the grammer and all please dont call out the old cat lady third grade english teacher on me. Thank you everyone
I really dont want to fight or argue I just wanna know what everyones got and what there getting for mpg etc.. hows it doing in power etc.. Im running 17 mpg city and 22 highway after three-four years. and that was on level surface. I used to get better highway mpg so I am beggining to see a decrease. and a delay in starting time. I used to tune her up every year. I live in nh and me and here it can get 20 bellow. sometimes I drive in snow on unplowed roads in the woods and inbetween the me/nh canadian border. alot of the time I dont use roads you would drive a stock vehicle down. If I brake down It is very possible not to make it to civilization on foot. and crap happens. I dont like crap to make other crap happen because of other crap.....Lmao so whats everyones mpg and hardware?what have you noticed in differnt hardware? What is the best you have tried?
What I'm currently running.
-Accell copper cap, and rotor
-Autolite 8mm wires
-Champion Copper plugs #71
I have a Mopar CAI, Borla headers, 3" exhaust, and some other bolt ons, and still prefer stock stuff. Even when I had Jacobs multispark I was using champion coppers. The engine overall runs better with champion coppers, and that's what I've experienced throughout my numerous tune-ups (I've done about 4 different tune ups within the last 10K miles, for various reasons) My current set up is my favorite so far. No extra coil, wires or module, and the jeep runs the smoothest it ever has. As for gas mileage, it isn't exact, but around 12.5 city with a 4" lift 33s, and a lead foot.
__________________ -1993 Grand Cherokee Laredo V8 5.2, Mopar CAI, Borla headers, Borla Y-pipe, Turn down exhaust, 4" RC SA, 33x12.50r15 BfGoodrich Km2, Crown extended brake lines, IRO Double Shear Track bar, IRO HD tie rod, Home made Quick discos, E-fan, Heavy duty harness/9007 bulb conversion, HP30 WJ knuckles lockrite solid cover.
Thats what the comp is telling me my magic school bus is getting. I dont use regular though I use 93 octane or above. I Beleive ive learned my lesson though. Dont go onto a forum on the internet and ask what people have and the results. The internet in the end and beggining is for people to ***** complain. and talk **** safely from there chair with there gay porn and dick in hand. It was suppose to be simple. list mods and ignition brand and parts gains if there where any and mpg. But thank you everyone that participated. Seams like there alot of marketing going on here aswell. I guess I will try doing this in person with the local jeepers and mechanics. And see what there results have been. champion plugs are what I put in my lawn mowers. And they dont work well in thoughs. Ive never put one in a car or truck. If I was going cheap I would put in autolite. as running smoothest. If you notice It running rough theres something wrong. out of all the systems ive tried the idle is usualy the same. My jeep has run smooth and had power on demand with bosch plat+4 and apparently I get better mpg. Im not talking on acceleration on level ground at speeds 30mph ic im getting 17mpg to continue going that speed. and so on at 60mph hw Im getting 22mpg. IM not sayying this is because of the aftermaket ignition system. there is alot of other mods on this jeep. Well I guess im done explaining myself. If you dont like it go **** yourself. Thanks again to everyone thats helped out.