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 Proton Wira VDO Engine or EMS400
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Posted - 30/03/2007 :  01:29:19 AM  Show Profile  Reply with Quote
Dear All,

Please note that we like to share with all on the Proton Wira VDO Engine (or EMS400) as a technical case-study.

A vehicle Owner came in recently with a Proton Wira 1.3 VDO or EMS400. (For identification, please check your engine top where you should be able to see a VDO cap or sensor.) The owner mentioned that he has problem shifting into gear, from automatic gearbox N (Neutral to Drive). The gearbox kicks when you shift into D at N. This was his problem.

This sounded more like a gearbox problem than any NGV-induced malfunction. Upon enquiring further, this problem developed after visiting a Balakong NGV Installer.

Connecting a Tachometer (a device that can read the RPM and functions as a strobelight), we have found that the petrol idle RPM was 1,400rpm, while the NGV idle RPM stands at 1,100. Our Proton Wira VDO 1.3 does NOT have an on-dash-board RPM meter.

Using a Scanner (Handheld PC), we found that the engine was at high RPM although the Engine idle was set at 750rpm. Real data shown 1,400rpm but digital setting was for 750rpm on Petrol. Ignition Timing was normal, and everything else digitally correct.

We spent almost 1 hour wondering which diagnostic tool was inaccurate. But all digital tools added up. Finally, we have to look elsewhere for the fault. And by Gosh, we found it.

The Accelerator Pedal Cable was shorter than usual, without a slack. Upon close inspection, it was cut shorter. When we asked the owner, he mentioned that the Balakong NGV mechanic has cut the cable. And with his confirmation, everything has added up very well. And this is what really happened:

The NGV Mechanic did not have a Hand-Held PC to digitally increase the Idling RPM on an EMS400 engine. Without the PC, he decided to cut the Accelerator Pedal cable shorter to increase the RPM. Since he cut it too short, he mistakenly had risen the RPM to 1,100rpm for NGV operation. But it also means higher for petrol at 1,400rpm. The gear kicking was the result of 1,400rpm engine revvs, and split-second gear engagement will result to gear knock, or kicking. Try to engage from N to D when you are at 1,400rpm, the car will jerk forward. This mechanic has created an Accelerating Engine to 1,400rpm while the brakes is applied. Also, imagine you are pressing the brake and stepping down the Accelerator Pedal with another leg at the same time. Then, shift from N to D. You get a kick.

What the mechanic wanted to do was to improve the idling speed for NGV operation - Owner's original problem with his car. As for Proton Wira VDO, you must to use the handheld device to increase RPM idle from Current rpm to max 875rpm. Upon getting a 875rpm, you need to tune the NGV to idle well. There is nothing much you can do as the Max is 875rpm, and there is NO manual tuning screw to open up the Throttle Valve (butterfly valve). CUTTING THE ACCELERATOR PEDAL CABLE IS NOT THE WAY. IN FACT, IT IS 300% WRONG. Worst still, he cut it too short; it is like you are always stepping on the accelerator to 1,400rpm on petrol.

The right way: Go to Proton Service center and ask the Proton guys to use their PC to increase the RPM to 875rpm or max idling speed. Then, return to your NGV Installer to have your Gas tuning. NEVER allow any cutting of cable. This will resolve your GAS idling problem, without introducing other problems. drx

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NGV Information Team

Edited by - NGVInfo on 30/03/2007 01:36:09 AM
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