Jetchip Jet20303 on '02 Trailblazer Ext 4.2L

Any installed this chip on their TB? Does it make any difference? I'm planning to get one so my TB can accelerate more smoothly.

When I currently accelerate, there is a hesitation after 20mph. I have to let go the gas a little and then resume. Anyone have other suggestions?

Thanks.

below is what I got from jetchip sales. I still wonder how much difference it would be to warrant my purchase.

> Subject: Re: stage 1 for 2002 Trailblazer Ext, 4.2L I6
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> You would use the same module as the 03 Trailblazer/Envoy with the 4.2L and auto transmission. 20303 for stage 1, or 20303-S for stage 2.
> The difference between the stage 1 and 2 is that a stage 1 is designed for a stock or mildly modified vehicle with modifications such as muffler or air filter, using mid grade fuel. Stage 2 is designed for a modified vehicle with a free flowing air filter or intake, a free flowing exhaust, a 180-degree thermostat, and you must use at least 91 or higher-octane fuel. Stage 2 is more aggressive on the timing curve to take into consideration the free breathing characteristics, lower temp, and high-octane fuel. Neither stage will effect the cruise control. All accesories should function as normal. If there is a problem, it is likely a connection problem.

I need your suggestions about which Jet PCM would be the best match. I own a 04 TB EXT 4.2L I6 engine & with the added length power is way down the go department & fuel economy needs improvement.

I'm planning to purchase a Volant Air Intake, PowerAid Throttle Body Spacer & JBA Evol Exhaust System. The fuel that I use right now is 93 octane & if I get a Jet PCM I will upgrade to a 95 or 96 octane.

Now with this setup, will the Stage 1 be able to accomodate all the mods or should I get the Stage 2 but without changing to a 180 degree thermostat? I'm hesistant to change my stock thermostat since I can't find any data to check if my temperature will be erratic or unchanged plus I can't seem to find any brand that is a perfect match for my engine.

Thanks in advance for your input.

i know this is old post..... Did you guys manage to install Stage 1 or 2. As I want to buy one soon. Does it makes any difference?
I have Airaid cold air intake filter, Magnaflow muffler and dual exhuast. Anyone esle??

I still haven't gotten a jet chip yet...haven't got enough input here to help... Hope someone can post more information on this topic as I'm interested in performance and saving mpg.

Ive heard mixed results; some people love them, others think they are POS and go with a Westers tune. Only a Westers tune and the jet chip are available for the TB/envoy platform with the I6 4.2L, the V8 can use almost any Tahoe/Yukon mod that has the 5.3L engine specified. Check before you buy. I was going to get a jet chip, then decided to not and buy some other things, and I have a Westers tune hidden in the back of my mind.

Well, I slapped one one my '04 Trailblazer, and I think it was worth the money. I noticed much better engine response and shifting. Not sure on HP gains, but I swear I feel a difference. I had already installed an Airaid cold air intake, TBS, and Borla cat-back dual exhaust. Premium fuel is kind of expensive these days, but you can't put a price on fun.

Does anyone even know where to get a 180-degree thermostat? I haven't found one in my searches.


Ive heard mixed results; some people love them, others think they are POS and go with a Westers tune. Only a Westers tune and the jet chip are available for the TB/envoy platform with the I6 4.2L, the V8 can use almost any Tahoe/Yukon mod that has the 5.3L engine specified. Check before you buy. I was going to get a jet chip, then decided to not and buy some other things, and I have a Westers tune hidden in the back of my mind.

I think we have some results. Did you go for Stage 1 or 2. Does it help if we upgrade to 180 degree thermostat.

Stage 2. I figured I did enough mods that I'd go for the more performance oriented one. I have no idea about the thermostat. Jet claims that it helps, but I haven't been able to find a manufacturer yet.

I think we have some results. Did you go for Stage 1 or 2. Does it help if we upgrade to 180 degree thermostat.