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Bucking under acceleration
I have searched and read several posts about this problem. I checked all of my intake hoses and I also just installed the LR silicone J boot (I had this issue before I got the new j boot).
But I still am getting bucking when I accelerate from 3k rpm to 3800. If I go WOT below that, I get normal acceleration all the way to redline. But if I'm cruising at 3k, then go 3/4 to WOT, I get bucking at 3800 or so. It's almost like it's the overboost or rev limiter. Any and all help is much appreciated. |
Sounds like a worn out potentiometer in your AFM or TPS. You can test them with an analog ohm meter. A digital ohm meter is not accurate enough when testing a potentiometer unless it’s an oscilloscope. |
I'll test it per Clark's Garage. Thanks
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I tested it, per Clark's Garage and it passed. No fluctuations as the barn door opened.
Anything I should be looking for? |
How are your plugs and plug wires looking? |
Have you checked for air leaks in the air/turbo system, both positive and negative pressure?
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I change my plugs annually and I put new 9mm wires on in 2012. They plugs/wires are connected nice and solid.
I'm not sure how to check the turbo system for positive and negative pressure leaks. How is that done? |
Five years on those wires might be the issue. It very well could be that easy. How many miles have you driven it in the last five years? I only mention that because electricity takes the path of least resistance and at 3000 to 3800 rpm’s is where the engine produces the most torque meaning the most resistance in the cumbustion chamber is happening. Take a look at them to see if there looks to be a vary small black spot on one or more of them where they could be grounding to the fuel rail mounts or anything else they could rubbing against. |
I've put on less than 10k miles since then. Is there a way to check resistance or is it as simple looking for burn/black spots on the cable?
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Yea I don’t think that’s your issue with that low of miles. Geez has your fuel turned to turpentine? |
Originally Posted by spencang
(Post 15250570)
I've put on less than 10k miles since then. Is there a way to check resistance or is it as simple looking for burn/black spots on the cable?
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I looked at Automotion's and Lindsey's website and there seems to be a lot to choose from. I have an MSD ignition and a Blaster 2 coil (new coil as of last summer). Any recommendations on new wires?
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Isn’t there supposed to be a risistor on the power wire to the coil if you use an MSD Blaster coil? Maybe not if an MSD spark controller is in place. Also I believe any new plug wires are good but use resistor wires if you listen to the radio. |
I once found bad ign wires by fluke (pun not intended)
when the garage lights were off & it was dark, engine running & hood up.. I saw sparks on the wires. Did you verify wire orientation is correct on cap? |
Originally Posted by Noahs944
(Post 15261014)
I once found bad ign wires by fluke (pun not intended)
when the garage lights were off & it was dark, engine running & hood up.. I saw sparks on the wires. Did you verify wire orientation is correct on cap? |
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