SPONSORED LINKS

95 Blazer RPM Surges at Highway speed

Tiny
DALLASX
  • MEMBER
  • 1995 CHEVROLET BLAZER
Hi,
I have a 95 Blazer with a vin Z CPI engine that has sat in a garage for a year. I recently did a tune up including new plugs, wires, cap, rotor, and ignition coil. I have also replaced the gas tank, fuel pump and sending unit.

The truck seems to run fine at idle and just cruising around town, but when I get on the highway running ~100km/h the engine has constant slight 50-100 RPM surges when trying to maintain speed. If I give it more gas the problem will stop until I level out the speed then it starts again.

All the other problems I searched relating to this issue seemed to have other issues like poor idle etc. My blazer idles perfectly, accelerates well, and the Engine light is NOT on.

Any suggestion on where to start troubleshooting?
SPONSORED LINKS
Friday, October 26th, 2007 AT 8:08 AM

2 Replies

Tiny
DALLASX
  • MEMBER
  • 3 POSTS
Correction, the engine is a vin W not Z.
Was this
answer
helpful?
Yes
No
Friday, October 26th, 2007 AT 2:31 PM
Tiny
DALLASX
  • MEMBER
  • 3 POSTS
I just bought a fuel pressure gauge and I'm getting just over 60 PSI @ key on. When it is idling I'm getting just over 55 PSI.

I think these pressure readings are okay.

I thought I might also mention I did put in a whole new gas tank and fuel filter as well.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, October 26th, 2007 AT 4:39 PM

Please login or register to post a reply.

Related Engine Revs Up Content

Idle Air Control Motor Replacement
GUIDE
Idle Air Control Motor Replacement
The idle air control motor or idle speed control motor is designed to adjust the air flow into the intake manifold at engine idle. Engine idle speed is monitored by the PCM...
VIEW MORE

Sponsored links