anyone know why my rpm's are jumping down then up while going down the road? it has done this in the past but stopped, acts like it starves for fuel for a split second. ill try changing the fuel filter again. just changed it out couple months ago but i put awhole lot of miles on it since then.
rpm's jump real quick
- Thread starter montec313
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SunlitComet
OBS Jedi-Do Good
Are you shure you don't have a random igntion dropoff as well or your pump is cutting out on you? Maybe wait until it gets really out of hand and throw a fuel pressure tester on it. if it is not happening continously at this point I would not bother with a filter right now. I would give you ignition parts a visual inspection first.
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Smasal
Full Access Member
Had same problem last week. Let me guess it has been up and down temperatures where you live the last week or so??? Buy some carb cleaner for $3 and spray it in your throttle body. Take an old tooth brush and clean it out. You will have better throttle response than you have ever felt. Mine was pretty black from all the build up and the condensation freezing and thawing all the time.
SunlitComet
OBS Jedi-Do Good
You sould have seen mine. I am in the middle of the fuel injector upgrade and I have been on the upper manifold with soaps, scrapers, solvent cleaner just to get it clean. I had some serious crust on that damn thing. Still not happy with it but it will have to do.
Well I cleaned the throttle body n stuff n it did do it for couple hundred miles. Now it back and worse than before. I'm bout tired of this tahoe. Tahoes are pos! My friend has one just like it and he always replacing parts. I'm ready to blow it up.
retorq
Full Access Member
That's the spirit!!
Could be LOTS of things, bad plugs, bad plug wires, dirty this or that, tranny tcc issue, etc, etc.
Could be LOTS of things, bad plugs, bad plug wires, dirty this or that, tranny tcc issue, etc, etc.
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Are you having any other wierd things happening electrically with the Hoe? The reason I ask is that an alternator going bad can have a similar behavior but normally it also affects other areas at the same time. One time I had an alternator going bad and before I replaced it if I pushed the lock/unlock button on the door the speedo would peg and then go back down. Once replaced issues went away.
retorq
Full Access Member
That's true ... your computer is expecting a 12v reference signal, it's it's not 12 weird stuff will happen.
SunlitComet
OBS Jedi-Do Good
I would suggest you get access to or see someone with a scanner that can log data and drive at a steady rate. any anomalies will cause a sudden change in data and narrow down the problem. Please don't blow it up. This is something you have to deal with engine systems now that are computer literate.
SunlitComet
OBS Jedi-Do Good
Holy crap that is probably the cleanest area in the manifod. Hate to see what the dirty area looks like.
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Keep us posted on if that fixes it permanently!
