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Power loss & won't go over 20mph


Tank899
12-31-2010, 02:57 AM
im having problems with my truck,its lost 90% of its power and its missing very badly,also water is coming out of the tail pipe,could it be a blown head gasket?

old_master
12-31-2010, 07:55 AM
What is the year, make, model and 8th character of the VIN?
Is the Service Engine Soon, (SES) light on?
If so, have you retrieved the Diagnostic Trouble Codes, (DTC's) and what are they?
What repairs have been done recently?
How many miles on the vehicle?

Tank899
12-31-2010, 09:28 AM
2000 s10 4x4 4.3,the vin is w,the ses light is on but the code is for the trans. i hooked it to a scanner it didnt show and codes that would cause it,iv just gave it a basic tune up thinking it would have fixed it,and a lil over 100,000

old_master
12-31-2010, 09:43 AM
Did you replace the distributor cap and rotor with the tune up? The next thing to check is fuel pressure and leakdown. Ignition ON, engine OFF, fuel pump running, pressure must be 60psi to 66psi. Pressure must remain above 55psi for 3 to 5 minutes after the fuel pump shuts off. Post your results.

Tank899
12-31-2010, 10:37 AM
i checked the fuel pressure after i seen that the tune up didnt fix it it it read 61psi but i didnt check how long it held pressure,i replaced everything cap ,rotor button,plug wire and plugs before i started buying puts it was missing on the last three cyclynders of the fireing order but it cleared up a little after the tune up

old_master
12-31-2010, 02:50 PM
What DTC's did you retrieve when you checked them?
If fuel pressure is at 61psi key on, engine off, that's fine, but we need to know how long it remains above 55psi.

Tank899
01-01-2011, 05:08 AM
i have to wait till i get another pressure gauge,do u need the number of the codes or just the read out?

old_master
01-01-2011, 10:32 AM
Post the exact DTC's in the order they were retrived.

Tank899
01-01-2011, 12:30 PM
it showed P0785 shift/timing silenoid malfunction but its leaking transmission fluid so that could be the cause of the code

old_master
01-01-2011, 12:44 PM
Ok, just wanted to make sure what they were. That shouldn't have anything to do with engine performance. When you get the leakdown checked, post the results. Might want to check fuel pressure again along with it. Try it a few times, sometimes the check valve in the fuel pump doesn't seal perfectly.

Another thing you can double check is plug wire routing:

http://i561.photobucket.com/albums/ss58/cwhook/97newer43Lfiringorder-Copy.jpg

Tank899
01-01-2011, 01:08 PM
i checked the leak myself it has to be fix it leaks all the fluid out in under 15 min's,i replaced the fuel pump recently

old_master
01-01-2011, 01:40 PM
Leaks transmission fluid out in 15 minutes? Or fuel pressure leaks down in 15 minutes? What brand fuel pump did you install?

Tank899
01-01-2011, 02:35 PM
transmission,idk it was like $80 i had to get one jus so the truck would start

old_master
01-01-2011, 02:58 PM
$80?? Theres the problem, now it starts and runs poorly. Aftermarket pumps are great if you like to replace them. Aftermarket pumps have trouble with excessive noise, low pressure output, excessive leakdown, fuel level sender "issues", poor fit, short lifespan, etc etc etc. Check out the customer reviews here: http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Fuel-Pump-Module-Assembly-Airtex_15770049-P_52_R%7CGRPFUE2AMS_1539460913___#fragment-3

If you want a fuel pump that will work correctly for 100K miles or more, get an AC Delco pump. Here's one that will fit your truck: http://cgi.ebay.com/ebaymotors/NEW-AC-DELCO-FUEL-PUMP-97-02-GMC-SONOMA-MU111-MU1751-_W0QQcmdZViewItemQQhashZitem19c1dd2111QQitemZ11062 6677009QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccesso ries

Tank899
01-01-2011, 03:22 PM
thanks dude uv been a real help ill try that and hit u up if i have any more probs

danielsatur
01-01-2011, 07:06 PM
How many RPM's do you got?
It sounds like your missing your horse power at the rear wheel, because of a leaky transmission.

Tank899
01-03-2011, 01:35 PM
i got a new code show its po452 evap sytem sensor low input idk what to do bout it

old_master
01-03-2011, 02:04 PM
At this point, don't worry about the P0452. It could be the fuel tank pressure sensor that came with the fuel pump, or the O ring where the module mounts to the tank is leaking, both could be attributable to cheapie fuel pump.

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