1995 Ford Escort poor idle

  • 1995 FORD ESCORT
  • 4 CYL
  • FWD
  • 121,000 MILES
Engine starts easy and engine runs smooth enough,
but at idle it jumps up to 2200 down to 700 and then eventually sputters and dies.
I have checked and replaced many vacum hoses and fixed an egr valve error code.I olny get test problem codes now 538,413. Could this be fuel related as in fuel pressure regulator?
Do you
have the same problem?
Sunday, May 3rd, 2009 AT 9:04 PM

1 Reply

The IAC solenoid controls engine idle speed and dashpot functions by regulating the volume of air by-passing the throttle plate. IAC solenoid positioning is determined by signals sent from the PCM.
Perform this test when instructed by QUICK TEST or if directed by other test procedures. This test is intended to diagnose:
RPM during SELF-TEST mode.
IAC solenoid.
Wiring harness circuits (IAC and VPWR).
Powertrain Control Module (PCM).
To prevent replacement of good components, be aware the following non-EEC related areas may be at fault:
Engine temperature outside correct operating range.
A/C input (electrical problem).
Incorrect throttle stop adjustment.
Faulty throttle or cruise control linkage.

Code 538 Displayed: System Failed To Recognize WOT Test
Repeat KOER SELF-TEST as follows:
Activate SELF-TEST.
Start engine.
Observe ID Code start of test.
Observe Dynamic Response Code 1 (Code 0 with STAR tester).
Perform brief WOT.
Testing is complete; Diagnostic Test Code (DTC) output begins.
Ensure vehicle speed reached 2000 RPM during WOT. If engine speed did not reach 2000 RPM, check for binding throttle linkage. If Code 538 is present, replace PCM. Repeat QUICK TEST. If Code 538 is not present, vehicle has passed dynamic response test. Service other codes if necessary.
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Monday, May 4th, 2009 AT 5:40 AM

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