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High Rev's At Gear Change


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#1 Becci

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Posted 08 February 2011 - 07:41 PM

Hello! Newbie here. Owned Escorts for years now and used to the 'normal' things failing like the temp sensors, fans, etc etc but this has stumped me. I've just got an Escort 1.6 Si Estate (R Plate) and everything's fine until it gets warm and the revs go to about 3000 on changing gear and drop immediately to normal. I'm not sure if this a ICV problem or a MAF problem or something more hideous like the clutch. Any advice would be warmly recieved!

Thanks,

Becci

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#2 vinnyvangough

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Posted 08 February 2011 - 08:58 PM

Could be the MAF.
Have the car running, and while its ticking over, unplug the MAF. If the car stalls, its fine, if there is no change in the running, MAF is faulty.
Could be worth removing the ICV and giving it a clean along with the throttle body.

#3 Becci

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Posted 08 February 2011 - 10:12 PM

Could be the MAF.
Have the car running, and while its ticking over, unplug the MAF. If the car stalls, its fine, if there is no change in the running, MAF is faulty.
Could be worth removing the ICV and giving it a clean along with the throttle body.


Thanks Vinny, the car stalled so the MAF is fine! Did the clutch test too (the whole handbrake on, try to pull away in 4th etc) and it stalled then to so I hope that means the clutch is ok. Will get someone to clean the ICV and throttle body as I've heard they're not the easiest of things to get out to clean! Fingers crossed!

#4 vinnyvangough

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Posted 09 February 2011 - 02:24 PM

Yea the ICV can be a right nightmare at times. Good luck and keep us updated

#5 lublin

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Posted 10 February 2011 - 04:07 PM

I found this info a while ago and thought it might come in handy one day.
Ford Escort 1.6 1.8 Zetec

Problem: High idle when car is moving and clutch depressed.

Troubleshooting procedure for above problem:

1. Road test vehicle to identify problem.

2. Use 4 gas analyser to check vehicle emissions:

- If oxygen too high, goto step 10.
- If oxygen is ok, goto step 3.

3. Check fault codes. For EEC V (close coupled catalyst) PCM, the software should updated to the latest version.

4. For EEC V vehicles, the PCM wiring needs to be modified. Bridging of pins 64 and 91 needs to be REMOVED.

5. Check the clutch switch for correct operation.

6. Check the HO2S multiplug for water ingress.

7. Check the PCM multiplug for water ingress.

8. Check the HO2S operation under live data on a diagnostic scanner.

9. For EEC IV (underfloor catalyst) vehicles, the PCM software should be caclibrated to the latest software version. This will rectify a number of known issues.

10. Check for air leaks.

11. Inspect the PCV (Positive Crankcase Ventilation) hose.

12. Detach the PCV hose at the PCV and block the end of the hose. If this solves the problem, a new PCV should be installed.

13. Check the IAC (Idle Air Control) valve part number suffix. If suffix is not '-AC' a new revised IAC valve should be fitted.

Note:

A revised wiring loom has been fitted since 07/1998. A revised IAC valve has been fitted since 10/1998. A revised PCM has been fitted since 10/1998.


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