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What is this discussion about? GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck

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#1164 of 1492 '91: Bad Gas Mileage??? by lisalmu Sep 24, 2005 (9:25 pm)
Hi all..   I just bought a '91 GMC 2500 5.7 Liter V8. Its a nice truck in and out. Excellent condition. great running condition. Lots of power. Smooth running truck. Idles nicely even at startup. No hiccups. Nothing to indicate anything was wrong. Its been very well cared for over the years.   Except. I'm getting 5 MPG!!! yes FIVE! I dont know what's wrong. It was just smogged on thurs. It passed. I can go 30 miles and use up a 1/4 tank of gas. Its a 22 gallon tank. If its getting 5 MPG empty, I'd hate to see it pulling a loaded horse trailer!!!   Does anyone have any idea why its such a gas hog?? Its killing me. I'm just glad this truck isn't my main transportation. I wouldn't be able to afford to even go to work!   Lisa Replies to this message: weels (Sep 25, 2005 7:57 pm)
#1165 of 1492 starter will not disengage by sprintcar1 Sep 25, 2005 (5:11 am)
ive had several eletrical problems:first side mirrors will not adjust electrialy :second pass. door lock will not work electrically but will work manually. third heat control problem can turn up or off but not down now the most serious last night i was woke by watch dogs to find the truck trying to start it self. meaning the starter was cranking the engine but since the ignition switch was in the off position it would not start. then the starter got hot from cranking and began to smoke ALOT. to stop this from happening i had to diconnect the battery. after i but a new starter what should i check next so this does not happen again? the starter has been replaced with a new starter due to previous accident Replies to this message: geo9 (Sep 27, 2005 6:23 pm)
#1166 of 1492 Re: '91: Bad Gas Mileage??? [lisalmu] by weels Sep 25, 2005 (7:57 pm)
Replying to: lisalmu (Sep 24, 2005 9:25 pm) That's terrible. I don't know how long you've had it or what's involved in the smog test, but if it runs that good and passed the test, that don't jive. Don't rule out that the guage might be bad. I guess you can tell when you go to fill it how much it takes. I wish I could help but everything I'm thinking of would also make it run like a pig. Did they sniff the exhaust as part of the test? Usually if it's running real rich the exhaust pipe will be black and sooty and smell like fuel. Does it have a catalytic converter?   - Tim
#1167 of 1492 GMC 2003 Allison Transmission by gmboy1 Sep 25, 2005 (2:08 pm)
FYI Just a note for the Do_it_Yourself'ers. I just finished changing the internal Filter in my 2003 GMC Allison Transmission, actually a piece of cake, no external attachments to remove, drain plug in pan actually works and all pan bolts are easily accessible. The internal filter is about $29.00 and the external spin_on was about $20.00. I could not find the capacity listed anywhere, but to let you know, it was approx. 10 quarts. Replies to this message: noobie1 (Sep 25, 2005 5:19 pm) gmboy1 (Sep 27, 2005 9:29 am) gmboy1 (Sep 28, 2005 7:19 am) noobie1 (Sep 30, 2005 6:15 pm) and 2 more...
#1168 of 1492 Re: GMC 2003 Allison Transmission [gmboy1] by noobie1 Sep 25, 2005 (5:19 pm)
Replying to: gmboy1 (Sep 25, 2005 2:08 pm) The fluid amounts as stated in the Service Manual are: "Fill after rebuild, 12.7 qts." and "Fill after fluid and filter change, 7.4 qts." Don't know why the discrepancy. You might double check the level being sure to use the procedure as stated in the Owners Manual. Kinda complicated.   Curious about the internal filter you mentioned. Can't find anything about it in the S.M. Is that its official name?   BTY - If there's an Allison dealer near by, you can get those spin-on filters for about $9.00.   -David Replies to this message: gmboy1 (Sep 27, 2005 9:29 am) gmboy1 (Sep 28, 2005 7:19 am) noobie1 (Sep 30, 2005 6:15 pm) gmboy1 (Oct 02, 2005 6:55 pm) and 1 more...
#1169 of 1492 Re: GMC 2003 Allison Transmission [noobie1] by gmboy1 Sep 27, 2005 (9:29 am)
Replying to: noobie1 (Sep 25, 2005 5:19 pm) Actually I had my neighbor get it for $8.00; GM wants $24.00. The discrepancy maybe due to the pan being off and the external filter off at the same time, It may have lost some from the Torque converter, which is fine with me. But again, it took 9.75 quarts to hit the middle of the HOT mark. The truck was on level ground. The internal filter is similar to most internal filters, GM Part Number is: 29537965. I am just anal when it comes to maintenance, even preventative, I change oil and filter every 3,000, the external trans every 6,000, the fuel filter every 15,000. I would rather send a little money now than get stuck on the road somewhere. It's cheap insurance.                                                            Bob
#1170 of 1492 Re: starter will not disengage [sprintcar1] by geo9 Sep 27, 2005 (6:23 pm)
Replying to: sprintcar1 (Sep 25, 2005 5:11 am) You wouldn't happen to have a remote starter ????????
#1171 of 1492 Re: Fuel filter [mailman2] by gmboy1 Sep 28, 2005 (7:15 am)
Replying to: mailman2 (Sep 14, 2005 5:24 pm) You probably have an answer to this, but I own a 2000 1500 w/5.3. All I do when I change the filter is to loosen the fittings and let the pressure bleed off, then R & R the filter.
#1172 of 1492 Re: GMC 2003 Allison Transmission [noobie1] by gmboy1 Sep 28, 2005 (7:19 am)
Replying to: noobie1 (Sep 25, 2005 5:19 pm) Dave,    Where did you find the capacities for the trans, I looked all through my owners book and the supplement for the Diesel and did not find it. Just curious ?                                 Thanks,                                             Bob Replies to this message: noobie1 (Sep 30, 2005 6:15 pm) gmboy1 (Oct 02, 2005 6:55 pm) noobie1 (Oct 07, 2005 5:08 pm)
#1173 of 1492 abs light by leggett Sep 28, 2005 (9:30 pm)
99 GMC Sierra- On initial start up, I get a red brake light and ABS light on instrument panel. Brakes appear to be working normally and can reset the lights by cycling the ignition switch w/ engine running. The dealer offered to repair for 1,000 dols- i declined and was able to determine the fault code from the scan tool was 0265 -"EBCM relay circuit open." Does this really require the replacement of the entire electro-hydraulic control unit- since i have found i cant just replace the EBCM? Or is there another fix i can attempt since it's a "relay circuit open"? What kind of job is it to replace the EHCU if i have to go that route? T

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