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Old 01-30-2013, 11:09 PM   #1
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Gas additives for throttle body/injectors

I have a 2001 Sahara 4.0 engine with auto and approx 65,000 miles. I've been noticing a slight hesitation from start-up for the first few blocks on cold mornings and was wondering if any of the additives for cleaning injectors would help anything, also cleaning the throttle body. Or can the throttle body only be cleaned by removing it from the engine? Is all that stuff on the shelves just snake oil?
New Autolight platinum plugs were installed about 8-10,000 miles ago.

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Old 01-30-2013, 11:12 PM   #2
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For sure, a fuel additive isn't going to clean a throttle body on an MPI engine.

This will:

http://shop.advanceautoparts.com/web...line_7670004-p

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Old 01-31-2013, 01:38 PM   #3
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Thanks for the suggestion. We don;'t have an Advance Auto but surely between O'Reillys, Auto Zone, and Bumper to Bumper someone will be carrying it.
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Old 01-31-2013, 01:48 PM   #4
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As far as your snake oil question anything u see on the available shelves is crap. However most places will keep the bg products behind the counter. Just ask for it by name. That's the only stuff I will touch. All the other stuff has the same stuff but about 70% useless additive. I'm in auto teck school now and my ASE certified teacher swears by it. I use all of them. They offer a combustion booster an fuel system cleaner and a before and after oil treatment. Best and only real stuff on the market if u ask me. Even if it doesn't help out your throttle body it's worth it to invest. I think a can of fuel system treatment is like $12.50. I'd do it if I were u.
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Old 01-31-2013, 03:14 PM   #5
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I just cleaned my throttle body last weekend. I used the "Berryman" brand cleaner from AutoZone.

Removing the throttle body is really the only real way to clean it, but it's really easy. 2 bolts and a hose clamp to get the air box off the top, and 4 more bolts to get the throttle body off. I removed the bracket the throttle cable was attached to because it was easier than removing the cable from the throttle body. In all, it took me maybe 30 minutes to remove, clean and re-install.
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Old 01-31-2013, 05:09 PM   #6
Knows a couple things...

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Clogged fuel injectors are nearly a thing of the past. Today's gasolines are mandated by the EPA to have sufficient detergents & additives designed to keep the fuel system clean. That didn't used to be the case 20+ years ago but it is now. That plus the lifetime (yes, really, no kidding) fuel filter in the fuel pressure regulator is positively huge with an extremely fine filtration material (looks like felt) will keep actual dirt out of the fuel system. The factory is so sure the fuel filter is good for a lifetime that you have to drop the gas tank to even get to it.

For a stumble, I'd be looking at other potential sources.... like a bad upstream 02 sensor, dirty idle air controller, bad throttle position sensor, bad or wrong model spark plugs, etc.
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Old 01-31-2013, 08:53 PM   #7
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x2 on the up stream o2 sensor
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Old 02-03-2013, 08:21 PM   #8
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The stumble/hesitation disappears within a 1/2 mile or so as soon as the engine even begins to get warm, would that still sound like the 02 sensor? I installed new Autolight spark plugs a few thousand miles ago, can't remember the numbers but they were the type Jerry always recommends for 2001 4.0 engines. That's about all I've done, other than normal maintenance, since it was new. Well, I did replace the idler/tension pulleys and the front bearing hubs.
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Old 02-03-2013, 08:36 PM   #9
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I could swear the Wrangler manual says additives are either unnecessary or advised against altogether (unfortunately I don't have it readily accessible).
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Old 02-03-2013, 08:48 PM   #10
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thanks for this thread, been wondering all this myself.
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Old 02-04-2013, 09:47 PM   #11
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Quote:
Originally Posted by Jerry Bransford View Post
Clogged fuel injectors are nearly a thing of the past. Today's gasolines are mandated by the EPA to have sufficient detergents & additives designed to keep the fuel system clean. That didn't used to be the case 20+ years ago but it is now. That plus the lifetime (yes, really, no kidding) fuel filter in the fuel pressure regulator is positively huge with an extremely fine filtration material (looks like felt) will keep actual dirt out of the fuel system. The factory is so sure the fuel filter is good for a lifetime that you have to drop the gas tank to even get to it.

For a stumble, I'd be looking at other potential sources.... like a bad upstream 02 sensor, dirty idle air controller, bad throttle position sensor, bad or wrong model spark plugs, etc.
Is there any kind of check for a bad sensor, what to look for on a dirty idle air controller, or a bad throttle position sensor? I'm pretty confident in the spark plugs since I used what is recommended.

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