1990 Ford Ranger check engine lite goes on & off

Tiny
RANGR90
  • MEMBER
  • 1990 FORD RANGER
Engine Performance problem
1990 Ford Ranger 4 cyl Two Wheel Drive Manual

In this 2.3L the check engine light is off at idle but goes on with higher rpm, then off again as rpm falls. Vacuum reads steady 21 lbs. What are the usual suspects?
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Tuesday, January 20th, 2009 AT 5:08 PM

5 Replies

Tiny
JACK42
  • MEMBER
Just rpm or vehicle speed? Could be an EGR problem, honestly too many things to guess, need to read the codes, check in "freeze frame/failure records since the light doesnt stay on
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Tuesday, January 20th, 2009 AT 8:37 PM
Tiny
RANGR90
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You wrote:
Just rpm or vehicle speed? Could be an EGR problem, honestly too many things to guess, need to read the codes, check in "freeze frame/failure records since the light doesnt stay on

Both rpm & speed, but I don't recall any pattern with speed & gear shifts.

What exactly do I replace if it's an EGR problem?

What do I need to read the codes on this vehicle?

Thanks.
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Wednesday, January 21st, 2009 AT 6:38 PM
Tiny
JACK42
  • MEMBER
You need and OBD-1 scanner. There are several pieces to the EGR system, once again, it would be a a wild guess
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Wednesday, January 21st, 2009 AT 9:23 PM
Tiny
RANGR90
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Where are the diagnostic self-test connectors located on this vehicle to connect the scanner?

What individual pieces makeup the EGR system in this vehicle?
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Thursday, January 22nd, 2009 AT 8:56 AM
Tiny
JACK42
  • MEMBER
Lets not get ahead of ourselves, you will need to check thecodes first. Imnot saying it is EGR, lets see what the comp says first. The connector is located on the right front fender apron, will say EEC test on the cap
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Thursday, January 22nd, 2009 AT 10:03 AM

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