sometimes no response on gas pedal motor goes to idle. - Alfa Romeo Forum
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(Post Link) post #1 of 10 Old 26-05-13 Thread Starter
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sometimes no response on gas pedal motor goes to idle.

Sorry for my bad English.

I have the following problem.
GT 1.916v jtd.
During driving sometimes there is no reaction on the accelerator pedal.
Even full pressed motor goes to idle. After pressing clutch and pumping with the accellerator pedal the motor start to react as normal and all is OK again.

This occurs 2 times a cold all the same.

Example: I drive a highway 130km/h for a while, in one moment the motor reacts like I let go of the pedal. But it is still in the same position. I have to do like above play with the accelerator pedal and clutch and all is normal again. No light's alarms no errors stored.

Anybody a idea.
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Last fuelfilter change?
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(Post Link) post #3 of 10 Old 30-05-13 Thread Starter
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Originally Posted by Malheus View Post
Last fuelfilter change?
Month ago.
Service. Filters and stuff.
Egr clean.
Sensor clean.
New glow plugs
New brake switch
Vgt turbo clean.
Rail pressure OK 1400 bar Max. 330 at start.
Injectors all OK under 0.5+-

Same problem.

Only way to start it working again is pressing clutch pedal....
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Just a guess - what if the brake switch signal to the engine management is intermittently sticking on activating a cross-check that stops you accelerating at the same time as braking? Pressing the clutch enables the accelerator again as it thinks you're not fighting the brakes any more. No idea if this cross-check actually exists on Alfas although Toyota certainly wish they'd had it!
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I'd check the plug connector onto the throttle pedal assembly, and the wiring from it - its possible that somehow the cabling is getting caught or pulled when the clutch pedal is pressed, causing some stress on the connector?.
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Most probably faulty brake switch...

Look if there are any errors stored in the ECU memory, you should probably see something like "accelerator/brake pedal coherency" if you have a faulty brake switch.
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Does sound like the ECU thinks the brakes are on. From memory the brake switch is essentially two switches in one, one half doing the lights and the other telling the ECU.
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It'd never occurred to me the ecu got a message that the brakes are on!
Interesting .
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(Post Link) post #9 of 10 Old 06-06-13 Thread Starter
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Iets probably the after market xenon...fukcing with the can signal . I keep you up dated.
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I've seen that once, when a lightbulb was about to die.... the lightbulb turned purple, the engine didn't respond and neither did the idle get regulated. if you added load on the engine the rpm dropped to well below 500...

new bulbs fixed that
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