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Chevy Suburban

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#674 of 944 1997power loss under acceleration by v8fun4u Sep 01, 2006 (4:54 pm)
My 150,000 mile, 97 sub would not start, and had the vehicle towed. the repair shop insatlled a new fuel pump. Drove it a few day all seemed well, then I seemed to lose power during heavy acceleration, like the exhaust was plugged or the trans was not working right. Ended up with a new trans. still does not work. unhooked the exhaust/new exhaust. still does not work. Dealer said needed a new distributor. Didn't help. Two dealers said it was the exhaust. Thats not it. Pressure reg in the intake did not help. Holds 65 psi when you turn on the key(not running) but when you turn the key off the psi goes to about 15 psi. Should the fuel pressure drop when you turn the key off? is ther a valve in the new pump that could be bad? There are no engine check lights on. Also starts slow. Replies to this message: redmaxx (Sep 04, 2006 7:29 pm) rspencer (Sep 06, 2006 8:17 am) bandemommy (Sep 06, 2006 3:28 pm)
#677 of 944 07 Suburban LT Quick Review by redmaxx Sep 04, 2006 (7:29 pm)
Replying to: v8fun4u (Sep 01, 2006 4:54 pm) I was rented an 07 Suburban LT this weekend and got to really put it through it's paces, lots of open highway and hilly driving. Loaded down with four people and a bunch of cargo, it handled pretty well, but, let's face it, it feels like a living room on wheels. The road can be felt and in the back seat it seems somewhat like jello. But not too bad. It is a truck after all. Steering feel is non-existant. Pickup is good, but you've got to get used to putting your foot into it, the throttle has a lot of resistance. Transmission is smooth, but you've really got to get on to the throttle to get it to downshift. Brakes are touchy. Displacement on demand is pretty good, but not seamless. On flat windy roads I could feel it lurch slightly when it switched between V4 and V8. Seats are downright painful. They feel like rocks for the first 1/2-1 hr of driving and lack lumbar support. Storage for the front is ample, but the back seat (middle really, we took out the third row) has only the seat backs, no door pockets or fold down center console. Interior plastics are slightly improved, since they now have decent texturing, but they are still mostly as hard as a rock with almost no soft-touch materials. Replies to this message: rspencer (Sep 06, 2006 8:17 am) bandemommy (Sep 06, 2006 3:28 pm)
#678 of 944 Re: 2003 suburban stalls [comajoe] by hardwaregirl Sep 06, 2006 (7:29 am)
Replying to: comajoe (Aug 30, 2006 5:29 am) I also have an '03 with about 73,000 miles. We've been having trouble consistently for almost a year now, but it's been more chronic the last eight weeks. Actually the first incident was trouble with the gas gauge after two years (and after the warranty was up). Then I got a check engine code for the gas cap not being tight, but I know that wasn't right. We've done a throttle body wash and several other things that didn't help. We've had the speedometer replaced since it went haywire for no reason. We also had to have the catalytic converter replaced (luckily under warranty). Recently my husband changed the crankshaft position sensor thinking that was the problem by suggestion on this discussion and from a friend who had the same problem. It died on him thirty minutes after replacing it. The problem was that the truck would run approximately 30 minutes and then shut down after stopping at a light. It would always happen between second and third gear and around 40 mph. I finally took it to a local dealership last week, and they diagnosed the problem as being a bad fuel pump module. My husband was really surprised since he is a construction equipment mechanic and said he'd never had a fuel pump work intermittently. He said they usually work or don't work. I had been complaining to my husband that my fuel mileage was declining since last fall. After having the fuel pump changed, my fuel mileage is back where it should be, and so far the truck runs fine. Unfortunately that little episode cost $925 since the module itself was $487. The good news is that it's warranteed for life--parts and labor. My question to the service manager was why GM didn't warranty the original fuel pump for that long. Of course, he didn't have the answer. I'm pretty sure this isn't the end of our troubles with this truck, but it's good for now. We'd buy something else, but none of the competitors have a truck that drives and rides this comfortably. I'm scared of the '07 model year just because it has been redesigned, and I don't want to be a victim of all the bugs they may have to work out of it. So for now, I'll keep driving this one and hope that's the end of the repairs for now.
#679 of 944 Re: 07 Suburban LT Quick Review [redmaxx] by rspencer Sep 06, 2006 (8:17 am)
Replying to: redmaxx (Sep 04, 2006 7:29 pm) Hey redmaxx - What kinda' gas mileage did u get on that Suburban LT?
#680 of 944 Predetonation (pinging) with 2001 5.3L 'Burb by middleseat Sep 06, 2006 (12:34 pm)
My 2001 Suburban (5.3L 4x4 LT) pings like crazy when the ambient temperatures reach about 95 - 100 degrees F and the truck is under mild to moderate acceleration (read "not floored"). I've taken it to the dealer and a private shop, neither of which could reproduce the problem (even when I took the technicians for a 20 minute ride). Simple enough reason why - on the dates that I took it in for diagnosis, the ambient temperature was only in the 70's. I live in the San Francisco Bay Area where the temps rarely get into the 90's.   At the private shop, the technician hooked up a SnapOn computer to watch while we drove around. He saw a maximum of 56 degreses of advance (that sounds like A LOT to me) but it never pinged at all during the test drive. He also saw the computer dial in some retard based on the knock sensors hearing predetonation. So that sounds to me like the knock sensors do work and the computer *is* responding.   So - I searched the forum expecting to find a lot of stories about ping but found little related to my situation. Has anyone else had this problem, and has anyone else had the problem *fixed*? It sort of sounds to me like a situation in which the computer is getting conflicting sensor readings - it *has* to be able to hear the pinging - *anyone* could hear it (I am not talking about subtle in any way) - so I wonder what else would be calling for too much advance and why the computer would choose to ignore the knock sensor inputs. I'm speculating here and may be completely wrong but want to try to spark some conversation. If there are any experts out there on the Suburban engine control computer, please I beg you, offer some advice   A couple of things *seem* to alleviate the problem - one is to put super in the tank (I run Shell or 76 regular in CA which means 87 octane). But the dealer has flat out told me that I should *NOT* have to put super in the tank. The other thing that *seemed* to fix the problem for awhile was to buy a bottle of Techroline (spelling?) but the fact is that it may well have been cooler out after I put in the cleaner so the cleaner may really have had no effect at all.   Thanks in advance for any possible help, Jeff Replies to this message: arrie (Sep 07, 2006 5:34 am)
#681 of 944 Re: 07 Suburban LT Quick Review [redmaxx] by bandemommy Sep 06, 2006 (3:28 pm)
Replying to: redmaxx (Sep 04, 2006 7:29 pm) Which rental agency did you use? I really would like to drive one extensively before I decide on a purchase.
#682 of 944 Re: Predetonation (pinging) with 2001 5.3L 'Burb [middleseat] by arrie Sep 07, 2006 (5:34 am)
Replying to: middleseat (Sep 06, 2006 12:34 pm) Check your MAF. If it reads too low air flow you get higher compression pressure in the engine than what the computer calculates, which could lead to knocking.   MAF measuring sensor wires can get dirty and lead to wrong readings. These small wires can be cleaned but I can't tell you what solvent to use. Rubbing alcohol perhaps?   MAF probably also has intake temperature sensor built-in to it like my '04 Tahoe has. Too high temperature reading would also lead to higher compression pressure than what computer calculates and cause the problem. Perhaps your problem is with the temp sensor as you say it seems to be temperature related.   A simple reason for trouble could also bee bad connection in the MAF wire harness.   --Arrie--
#683 of 944 Predetonation (pinging) with 2001 5.3L 'Burb by middleseat Sep 07, 2006 (9:30 am)
Thanks for the suggestion Arrie. The private shop said they checked the MAF (and many years earlier, this same shop fixed a detonation problem in a different vehicle and the problem *was* directly related to the MAF). So I *think* this is not the issue - however, I will ask them when I next visit their shop. I don't know if the temperature reading is something that would be part of a data dump (after connecting this snap-on computer) but I know the techician spent a good hour reviewing a batch of data looking for glitches like this (i.e., a reading that is obviously out of wack).   Anyway, I like your idea and it makes sense so I'll follow up with the shop.   Anyone else have any other ideas? Has anyone had this problem and had the dealer solve the problem? If so, what did they do?   Thanks, Jeff Replies to this message: arrie (Sep 07, 2006 6:09 pm)

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