RPM jumping.

Asked by Apr 29, 2015 at 06:29 PM about the 1991 Chevrolet C/K 1500 Standard Cab LB

Question type: Maintenance & Repair

I've recently changed the starter, battery, positive wire, spark plugs and spark plug wires.
the truck starts fine but the rpms are constantly jumping. what could be the cause of this?

1 Answer

7,840

I have to ask... are there aftermarket ignition parts, sensors or wires? You can google 'tach jumping' and find that no specific thing causes this that any data has been compiled. There are 4 ways i have encountered the causes, and one , the customer was willing to pay his bill. You can research instrument pod issues and tachometer sensor issues and have it lead to clues about how yours is. But you have to know how yours is. The electronics can have redundant circuitry? or have those circuits missing that make it like OEM when it worked best.

Your Answer

Add photo

Related Questions

Search Chevrolet C/K 1500 Questions

Chevrolet C/K 1500 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 3,140
#2 John Saffrahn
John Saffrahn
Reputation 2,440
#3 Rowefast
Rowefast
Reputation 1,740
View All

Related Models For Sale

Used GMC Sierra 1500
880 Great Deals out of 64,792 listings starting at $1,500
Used Ford F-150
2,425 Great Deals out of 211,459 listings starting at $895
Used Chevrolet C/K 2500
220 listings starting at $3,199
Used Chevrolet C/K 3500
244 listings starting at $5,000
Used Chevrolet Camaro
137 Great Deals out of 35,623 listings starting at $1,995
Used Chevrolet S-10
6 Great Deals out of 1,428 listings starting at $1,995

Used Cars For Sale

1995 Chevrolet C/K 1500 For Sale
100 listings starting at $4,800