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Topic: stalling engine sounds sick (Read 9337 times) previous topic - next topic

stalling engine sounds sick

hi there new to forum but owned my cougar for over 10 years and its never let me down......until now. from cold car starts and stalls instantly restarts with a bit of throttle and its purring again for about 2 mins on tick over,30 seconds if you keep the revs up.when reved up during this stage everthing is fine.then it will stall or try to stall rev it up and it sounds air rushing whiring sound keeps cutting out for a fraction of a second and spits when you let the throttle off.any help would be most welcome.

stalling engine sounds sick

Reply #1 –
check for any stored computer error codes.
Mike

stalling engine sounds sick

Reply #2 –
its a 1986 3.8 cfi not sure how to do it with a voltmeter as it has no engine check light.i have found the test connector.if the test connector has the long side at bottom what goes where?

stalling engine sounds sick

Reply #3 –
its ok i think iv got it.jumper from top right pin to the single connector. voltmeter or bulb second from left to battery +

stalling engine sounds sick

Reply #4 –
ok had a break in the weather.koer code 34 egr valve pressure transducer/postion sensor sonic voltage above closed limit do i need to replace or clean and where is it?

stalling engine sounds sick

Reply #5 –
I know on my old 83 5.0, the egr valve got stuck open with a big chunk of carbon. Just take the valve off, clean it, make sure it moves in and out freely. You might get lucky and find something holding it open.
CoogarXR : 1985 Cougar XR-7

stalling engine sounds sick

Reply #6 –
cleaned and refitted still got code 34

stalling engine sounds sick

Reply #7 –
When you had it off, did it move freely? You are sure it's seated when it's closed?
CoogarXR : 1985 Cougar XR-7

stalling engine sounds sick

Reply #8 –
yes it has a free action and responds to vaspooge and seals up

stalling engine sounds sick

Reply #9 –
Code 34

Key on engine off, key on engine running, continuous memory.

Insufficient egr flow/excessive exhaust back pressure; or evp voltage above closed limit (sonic) pfe sensor voltage high or out of range.
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stalling engine sounds sick

Reply #10 –
Quote from: mr glee;446755
yes it has a free action and responds to vaspooge and seals up
If the sensor is the round one with small shaft the fits into EGR valve it's probably bad, was a common issue 20 years ago, doubt it's improved with age... Do be sure the O ring is sealed...

stalling engine sounds sick

Reply #11 –
ok checked the evp with avo all was ok but vref was 3.76 volts would this give code 34 if so how can i fix it?

stalling engine sounds sick

Reply #12 –
just checked the evp and got 1.2 volts but whe removed from the egr valve 0.26 volts i have worked out the rod is pushed in about 5mm when fitted egr valve is this right?

stalling engine sounds sick

Reply #13 –
Looks like it should be below 0.67V. Either your valve isn't seated, or your EVP is bad.

EVP Sensor Info
Code 34
Sonic EGR Info

The sonic EGR actually operates by creating sonic (M=1) or supersonic (M>1) flow at the EGR pintle, thus allowing constant flow through the EGR nozzle  regardless of back pressure. (Same idea used in rocket motors)  It allows you to reasonably calculate EGR flow without have pressure sensors - aka DPFE

stalling engine sounds sick

Reply #14 –
going to get both just to be sure.also keep getting code 83 high speed electro drive fan circuit failure on koeo the code table print out i have was for later models and said sc only which i took as super charged only.just got a chiltons manual much better than the old haynes manaul that i have but no info on this.