vacumm leak??

[Nasariobv]

ok i finnaly finish my air intake from, i used a cobra elbow, intake tubing, and a 8 inch k&n filter, im gettin good boost and good throtle responce , but my gauges are all off, like big time my rpm is jumpin all over, so is the speed???i changed all vacumm lines with silicon lines??? anyone heard of this before????

 

[PPI Typhoon]

That type of gauge cluster isn't mechanical. If you have jumping like that, it could be bad sensors or a bad ground. Try searching for "jumping tach" or something to that effect and it might point you in the right direction. I don't see any reason why changing vacuum lines would do that except if you happened to knock a wire loose while doing the exchange.

 

[Nasariobv]

ok

ok

ok thank you very much

 

[GM TURBO]

Generally tach jumping is ignition related - however with the other jumping you speak of - I'd look towards electrical. If a plug wire were arching to the block - you might see it - although chances are you'd feel it also. But you say the truck is running well.

 

[Nasariobv]

ok

ok

ok its flutters as usual in park or neutral, but under drive with boost going the tach is jumpin everywhere????it was working fine with the stock crossover intake????but that was a few months ago???i put new taylor wires, new acdelco plugs, new conrad cap and rotor......but i have not replaced the stock coil and the sy has 115k miles...

 

[PPI Typhoon]

Re: ok

Re: ok

ok its flutters as usual in park or neutral, but under drive with boost going the tach is jumpin everywhere????it was working fine with the stock crossover intake????but that was a few months ago???i put new taylor wires, new acdelco plugs, new conrad cap and rotor......but i have not replaced the stock coil and the sy has 115k miles...

My tach flutter was due to my ignition module. I replaced it and it hasn't done it since.

Might give that a shot.

 

[Nasariobv]

ok module

ok module

ok i did a search on the module, kragen carries part #D1943A AC Delco for $61.00 but GMpartsdirect has part #10482827 for $35.99, which one should i get???

 

[GM TURBO]

I think I have one in the garage - I can check the P/N when I get home.