Speedometer jumping?

jjorgensen52

jjorgensen52

NHSTE - I'm the only one!
Noticed this ever since I finished the truck, but didn't think about it until now... since I am doing homework at 1230 am these kind of things come to me :lol: . My speedometer bounces under acceleration.... a lot... like, 30 - 70 and back, until I settle down to a steady speed, then it slowly bounces it way back to the right place. Any idea what could be causing that?
 
Daryl H

Daryl H

Donating Member
Re: Speedometer jumping?

jjorgensen52 said:
Noticed this ever since I finished the truck, but didn't think about it until now... since I am doing homework at 1230 am these kind of things come to me :lol: . My speedometer bounces under acceleration.... a lot... like, 30 - 70 and back, until I settle down to a steady speed, then it slowly bounces it way back to the right place. Any idea what could be causing that?
Click to expand...


You have ignition issues.
Could be bad plugs, wires, cap and rotor are usual suspects.
Get some NGK's and some good wires to go with a brass cap and rotor.
 
jjorgensen52

jjorgensen52

NHSTE - I'm the only one!
Re: Speedometer jumping?

Daryl H said:
You have ignition issues.
Could be bad plugs, wires, cap and rotor are usual suspects.
Get some NGK's and some good wires to go with a brass cap and rotor.
Click to expand...
Plugs, wires, cap, rotor, ignition mod, coil, all have about 1000 miles on them. It's been doing that since the day I put the motor back in.

Any paticular DRAC wire to check or just fiddle with them all?
 
JSM

JSM

Active member
Re: Speedometer jumping?

jjorgensen52 said:
Plugs, wires, cap, rotor, ignition mod, coil, all have about 1000 miles on them. It's been doing that since the day I put the motor back in.

Any paticular DRAC wire to check or just fiddle with them all?
Click to expand...

the blue one
 
jjorgensen52

jjorgensen52

NHSTE - I'm the only one!
Re: Speedometer jumping?

JS Manufacturing said:
the blue one
Click to expand...
Alright, I will check that when I get home next weekend.
Glad to hear it isn' t the ignition, hate to have to spend $$$ on that since I'm going to be getting the individual coils to work hopefully pretty soon.
 
jjorgensen52

jjorgensen52

NHSTE - I'm the only one!
Re: Speedometer jumping?

hatrik8 said:
This is an old post, but I am having a similar issue. Wondering if you got around to fixing it.
Click to expand...

I haven't noticed it anywhere near as much after the last time I r&r'd the engine, I think it must have been a loose ground in the ECM harness.
 
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