Intake manifold swap. 97 to 99. Missing something?
I have a 97 ZJ with a 4.0 I6. I have gathered on here that swapping the intake manifold from a 99 WJ 4.0 will give me a good upgrade in power. I have read most of the searchable threads, but still have one remaining question:
It looks as if it is a straight swap, but before I dive in, IS IT? Are there any modifications I need to make to the new one? Is it as simple as a 'remove/replace' as all the threads make it seem? I just want to be sure.
I don't want to tear apart the top part of my engine just to find out I forgot something stupidly obvious. Any advice from someone who has done this would be greatly appreciated.
I am hoping that swapping intake, and adding cold air, and a header back exhaust will really boost me up power wise.
I just did mine a few weeks ago, and for yours, being a 97, it is pretty straightforward. Biggest thing is, post 96 you didnt have to make any adjustments to the power steering pump, so you are lucky. The hardest thing for me was fitting the vacuum lines in the right place, and I did have to lengthen the air temp sensor cables. The fuel line bolt was also way off so I had to jimmy-rig a solution by getting 2 pieces of metal, drilling holes, and bolting the 2 pieces together, mashing the original holder and the new one together. The new manifold only has 1 bolt instead of 2, so I had to drill a hole right in the middle of it for it to be stable.
1996 ZJ 4.0 Laredo... you know, the one with the ripped leather seats
The vacuum lines have to be slightly modified (get pieces and elbows from the junkyard while you're there), the fuel line bracket needs to be redrilled (not an issue), and the air temp sensor either needs to be lengthened or you can move the sensor to where it can reach like I did (there's plenty of ports to do so).
My cylinder head overhaul: http://www.jeepforum.com/forum/f13/cylinder-head-r-r-picture-heavy-1348138/
My transmission overhaul: http://www.jeepforum.com/forum/f13/how-change-transmission-electronics-1560948/
More efficient spray pattern that leads to better atomization of the air/fuel charge as it enters the cylinder. Depending on the condition of your current injectors, some people see an increase in fuel economy, but most everyone notes quicker start up, smoother idle and increased throttle response.
You can buy reman'd injectors on eBay for around $80 for a set of 6, or you can pull them at the local JY and purchase a $12 o-ring and micro filter kit and rebuild them yourself. For my set of 8 injectors, I paid $3.50 per injector and $15 for the rebuild kit. I did have one injector that was stuck open, so I exchanged it at the JY for another one, but aside from that it was a smooth and straight forward swap. Plus I spend less than half the cost of buying a set online. There's a large thread on here going over the swap if you search for it.
__________________ His: '00 WJ 4.7 Limited- Zone 4" SA lift, JKS BPE's
Hers: '03 WJ 4.7 Laredo- IRO 3", 245/75/16 Duratracs, Bilstein Shocks, JKS TB w/KOR Bushings, Rusty's A-Arm Spacer, CORE4x4 Adjustable Front Control Arms, Dynomax Exhaust, RB1 Nav -Coming Soon- Overland Rock Rails
you can pull them at the local JY and purchase a $12 o-ring and micro filter kit and rebuild them yourself. For my set of 8 injectors, I paid $3.50 per injector and $15 for the rebuild kit. I did have one injector that was stuck open, so I exchanged it at the JY for another one, but aside from that it was a smooth and straight forward swap. Plus I spend less than half the cost of buying a set online. There's a large thread on here going over the swap if you search for it.
what year and model would one find these injectors in?