01 jimmy no power


must
12-08-2009, 07:34 PM
I have 01 jimmy that has no power when i step hard on the gas, the revs dont increase, and it bogs, but if i step slow or let go the gas a bit and then step on again then it starts to pick up speed. Some days it runs better than others, and when the engine is cold it acts up more. I have to baby it to get it up to speed I also have goten codes po128 and p0410 every now and then.Any help would be much appreciated.

maxwedge
12-08-2009, 08:08 PM
Welcome to AF. 128 is the thermostat, engine is out of temp range or the temp sensor is bad, a scan will show that, 410 is the AIR system which wouldn't affect power. Low fuel pressure, or a bad cat are the more common issues with the symptoms.

must
01-10-2010, 07:14 PM
I still have the same problem after changing the whole exhaust including the resonator/pre cat, cat, and mufler, so i guess that wasnt the problem. I was wondering if it could be a bad distributor? I also noticed that if i floor the gas the rpm's drop and engine feels like it will stall, and sometimes depending how long i keep my foot on the gas the engine backfires. Any help would be much appreciated, I just need this jimmy to last until the spring.Thanks.

must
01-10-2010, 07:16 PM
Does anyone know how much you get for scraping the catalytic converters, I know they are worth someting because of the special metals in it

old_master
01-10-2010, 07:49 PM
Scrap rates vary depending on the area, check with a scrap metal dealer.

As maxwedge mentioned... have you checked fuel pressure and leakdown?

b1lk1
01-11-2010, 03:32 PM
Clean the Mass Airflow Sensor too. Mine caused all kinds of driveability issues yet did not set any codes for it.

must
01-11-2010, 06:50 PM
I forgot to mention that i checked the fuel pressure and it was at the lower range but still within the limit.

old_master
01-11-2010, 06:58 PM
What was the pressure and how long did it remain above 55psi after the fuel pump shut off?

must
01-11-2010, 07:07 PM
The test was done about a month ago I think the pressure was about 60psi if i remember corectly all i know for shure that it was within the working limits wich i checked to make shure, but i did not check how long it stayed above 55psi

old_master
01-11-2010, 07:31 PM
Excessive leakdown will cause a lack of power, better check it again to be sure.

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