My Grand Prix started losing power when going up hill just started today.Check engine light flashes when it happens then stops when car hits level ground no fault codes showing thanks for any help
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09-02-2017
My Grand Prix started losing power when going up hill just started today.Check engine light flashes when it happens then stops when car hits level ground no fault codes showing thanks for any help
09-02-2017
No codes ? Says what ? DIC? or actual scan tool ?
09-02-2017
scan tool
09-02-2017
K, swierd. I thot 4 sure a flashing cel would set a code ?
09-02-2017
Does it also flash during WOT?
09-02-2017
clogged cat or it needs a tune up super bad.
scan the car running after it flashes, it might show a pending code. pending codes can clear if you shut the car off.
09-02-2017
Ahhh..Originally Posted by Scottydoggs
09-02-2017
Scotty just started getting a po300 code new plugs and wires last year
09-02-2017
Did not try this
09-02-2017
Showing a p0300 code after a rescan
09-02-2017
how many miles it got? ever been tuned up ? 300 is the multiple misfire code.
09-02-2017
missed this post, miles? cat might be clogged.
09-03-2017
Got 120000 on car new plugs and wires at 100000 also had to change ignition control module at same time and a bad coil . Just found out when in park and rev up engine noticed it wont rev past 3500 rpms
09-03-2017
No flash but will only rev up to3500rpm
09-03-2017
That's how it is supposed to be. That is a safety feature.
Also there is no flash because there is no load. If you want to put load on the engine put it in drive and with your left foot on the brake hit the gas with your right.
09-03-2017
Here's a funny thought.
What if was a clogged fuel filter, and the fuel pump had enough on level ground, but once it had to pump "uphill" too......lol would also explain the P300's.
I'm still drinking coffee, ignore me.
... our lady of blessed exceleration, don't fail me now ...
09-03-2017
not, heres the deal, flashing cel means one of two things almost always. cat, or needs a tune up real bad.
pull the o2 sensor to make a exhaust leak pre cat, it should run better if the cats bad, sound like crap tho.
09-04-2017
A flashing CEL means its breaking NOW. Attaching a scan tool and reading whats going on. Looking at long term and short term fuel, o2 readings, misfire counters if available.
One old time test for fouled cat is warm engine then rev it up and hold it at around 2000-3000 rpm and I like sitting a plastic jug about for or so away from exhaust pipe. Generally if converter is plugged the exhaust is forced through smaller area and super heats converter and exhaust and can be felt at tail pipe.
Proper diagnosis starts with reading PIDS. Fuel psi , air in, LT/ST, map, IAC if equipped, o2 ranging, misfire counters per cylinders.
09-04-2017
Thanks for everyones input.Up date on problem found an vacuum hose leaking replaced hose car ran better but still starts losing power when you get up to 40 miles an hr.
09-05-2017
cause clogged cat.
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