ninedeep

When I am driving at a consistant speed, all of the sudden the car jolts really hard. Maybe I am having a hard time explaining what it is...... so here I go,
its like this (W/ exhaust) irrrrrrrr shut off(jolt) irrrrrrrrrrrrr.

Can someone please give me some ideas of what I should check for.

Thanks

cthree

sounds like you are missing. Check your plugs and connections.

xviper

Try what Cthree just suggested.
However, it's hard enough to diagnose a problem over the internet. It's even harder if you do not give more specifics. What road speed? What engine speed? What gear? Mods? Someone here asked about a problem a while ago and after a whole page worth of replies and no solutions, the original author then tells us that he had a VAFC with maybe a wire or two loose.
Without ALL the details, anything you get here is PURE guesswork. (And even then, it's still a guess.)

cdelena

Read the MAP sensor threads.. if this is happening at relatively high throttle openings it is a suspect.

ninedeep

Maybe the plugs....I check that, but I do have a VAFC and I didnt even think about checkin loose wires.

xviper

Ahhhhhh! Details can be so important. Have you seen the threads where it is stated that the stock ECU needs to be reset about once a month if you have a VAFC? In time, it seems that the ECU will go back to its default modes and ignore the VAFC. Maybe your's is just "reverting". I don't have one so I can't say for sure how accurate this info is.

ninedeep

Oh....is that so...Ill check that out too.....are you saying I should record myVAFC settings and then disconnect the Bat. Whats funny is that while Im driving, if I tap the ECU pannel my car does what I was trying to describe. I think somethings loose in there. I feel a little better now thanks to everyones suggestions, because I know how to make the problem happen. Now I can fix it.

Thanks

xviper

[QUOTE]Originally posted by ninedeep
[B]Oh....is that so...Ill check that out too.....are you saying I should record myVAFC settings and then disconnect the Bat. Whats funny is that while Im driving, if I tap the ECU pannel my car does what I was trying to describe. I think somethings loose in there. I feel a little better now thanks to everyones suggestions, because I know how to make the problem happen. Now I can fix it.

ninedeep

Hey Xviper and everyone else who replied....thanks for the help. Its fixed!!!!!!!

There was some loose wires to the ECU, so Jon over at Evolution fixed it for me.

Thanks again

xviper

Geez, and I only mentioned the bit about the VAFC as an example.