420A Bucking and Stalling

sdpnoy · Apr 20, 2012

Long story short, the car has been bucking and now stalling.

I've replaced most sensors, fuel filter, ignition and now the ECU. I haven't replaced the fuel pump...yet.

I replaced the ECU 3 days ago and it was running fine till yesterday. I was on the freeway doing about 65 and I felt the car buck. It did it 2 more times and it finally shut off. I pulled off to the shoulder and it would not start again. The engine turns over no problem but no spark/fuel and no CEL.

Called and got a tow truck to tow it back. 45 minutes probably went by and once we got it off the flatbed, it fired right up.

I'm at a loss.

99 Eclipse RS

SoopaStar · Apr 20, 2012

I don't know much about the 420a really but did you do your plugs and wires? Do you have a catalytic converter still?

sdpnoy · Apr 20, 2012

Yes and yes. Sounds like when it got up to operating temp, it decided to go haywire

canada4g63 · Apr 20, 2012

maybe a bad fuel pump, coil pack, plugs wires, fuel filter

SoopaStar · Apr 20, 2012

did you replace the fuel filter to help resolve this problem or just because? have you run any injector cleaner through it?

TheBlueNinja89 · Apr 26, 2012

is it automatic? and do you always get gas at the same place? bad gas is a possibility

nicks tsi · Apr 26, 2012

same thing happened to mine it was my camshaft sensor

at a cold start it waits for it to be completely warm?

camshaft position sensor

sdpnoy · Apr 26, 2012

Car is a manual.

It seems to do it when the car is at normal operating temp. When cold, car is fine but these cars warm up fairly quickly.

nicks tsi · Apr 27, 2012

yeah that's what mine did it was the camshaft position sensor

sdpnoy · Apr 27, 2012

I'll give it a shot. I'll let you know. Thanks

BoostedPhoenix · Apr 27, 2012

Crankshaft position sensor is more likely to fail than the cam sensor and displays the symptoms you described exactly. When the engine is hot it will misfire and stumble. Once its cooled down it will run normally again. The Cam sensor is capable of producing these problems on the Chryslers also but will usually set a CEL after a few times, the crank sensor takes much longer to figure itself out.

bryanwheat · Apr 27, 2012

You can test all sensors with a multimeter. Buy a haynes or chilton manual and start testing.

BoostedPhoenix · Apr 27, 2012

Crankshaft sensors can and will test perfectly fine when cold then develop a short or open circuit when hot. testing them is very difficult because by the time you can get under the car to unplug it, it could very well test normal.

killface · Jun 23, 2012

i think it would be the fuel pump, and like the rest bad fuel lines maybe and filter but i am also not a 100 on that idea just a option for you to think about.

dalesmitsu · Jun 25, 2012

If you have fuel/spark this eliminates faulty pump/coil pack. Which, I think you. When you turn key on prior starting, if you hear fuel pump prime then its good. You can test the coil pack with an multimeter. Or install your coil pack on a 2000ish Neon, if it starts it good but multimeter would be better, see how many volts it putting out.

Do you have egr block off plates installed.

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420A Bucking and Stalling

sdpnoy

SoopaStar

sdpnoy

canada4g63

SoopaStar

TheBlueNinja89

nicks tsi

sdpnoy

nicks tsi

sdpnoy

BoostedPhoenix

bryanwheat

BoostedPhoenix

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dalesmitsu

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