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Vans & Minivans Chevy Express & GMC Savana Chevy Express/GMC Savana
618 messages, Last post on Oct 31, 2009 at 12:44 PM
You are in the Chevy Express & GMC Savana Forum. Your Host is Karens
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Hi, I have a 1999 express van with the 5.7 V8. While driving at speeds over 40 mph the motor is starting to stumble - will hold/increase speed but does it under minor protest. Any help would be nice. I'm thinking fuel pump (only have 50psi - should be 65ish?) 180,000 miles with new plugs, wire, cap, rotor, oil change, air filter, and fuel filter |
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Replying to: hopkinstx (Sep 16, 2006 5:59 pm) |
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I have a express van with the 5.7 V8 that is giving me 3 check engine codes P0161 - o2 heater bank 2 sensor 2 (which side - o2 after cat?) P0300 - misfire (Will low fuel pressure cause this one?) P0420 Cat. efficient low on Bank 1 (what should I check?) Which side would bank 1 and bank 2 be? I have replaced both of the O2 sensors on the passenger side last year. |
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Are these two vans the same product off the line excpet for the name plate? Great forum here! Thanks! RonWind |
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Zoyberg, I dont think your fp is your problem. 50 is actually normal. 58-63 is the book amount I think, but virtually all the ones I ve checked are 50-54 running. I believ its the difference between key on and running with vacuum pulling the fp down alittle. Since you did plugs and wires, thats probably the problem. Put cheap copper plugs in again, and check the wires carefully. The hesitation is undoubtably a mis causing your nisfire code. The bank 2 sensor 2 should be the passenger side rear (after cat) o2 sensor. My scanners can watch each o2 sensor seperatly to verify the operating condition. The 420 code, has me stumped, other then a lazy o2 (rear drivers) or a bad cat itself. If you have plugged cats, that could cause your mis, the exhuast not being able to get out, thus causing a huge back up in the cylinder. Ussually they get progressively worse till the cat is completely closed and the veh will not run, or just barely. I would suspect the cats, maybe more if you towed with it, and or it has a lot of miles. Ronwind: Yes the gmc and chevy express are the same vehicle with different name plates. Some say the gmc's are built better, and I always laughed at that, but just recently I compared an 04 express to my 03 savana. The savana does have some bolts holdng small trim peices on were the express does not, and it uses a spring clip. So it does infact look like the gmc maybe built a tinny bit better. The grills and trims are different but all the major parts interchange, and many of teh van parts interchange with the chevy/gnc trucks also, like the 1500's and 2500's. Most of the van parts are left overs from previous year truck builds. The vans get the left over stuff. The 04 express awd, I just referenced is almost done......I put on larger combustion chamber heads, a mls head gasket, head studs, a z06 vette cam, a cummins intercooler, and ballbearing pt 72 turbo. It should make in the middle 500awh area soon. |
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Replying to: gmjohn (Jan 18, 2009 6:59 pm) I tow a 30ft I/O Pontoon most weekends May thru September, 25 to 30 miles each way. You really know it is there mostly at 50MPH+. From a stop you hardly notice. When I first tested a similar tow vehicle it had a 5.7L and was much better at the 50MPH+ speeds. Start/Stops were equal. Hope that helps.
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right turn signal works good thenwhen i put brake on turn signal speeds up, ??? how do I fix
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Replying to: cjolibois (Apr 14, 2009 8:18 pm) The reason they fall on there face at 50 + mph is power and gear ratio. The 4l60e takes a huge jump from 2nd to 3rd. 3rd is 1 to 1, and if you dont have the tow package you have 3.42 gears. Tow package vans got the 3.73's. A huge improvement is to reprogram the pcm for different/later shifting. Hold second longer and have it shift to 3rd at a higher rpm/speed. This could be done only when towing via programming but would be harder then just having it do it all the time. When I bought mine, I reprogrammed it the next day.......and I still tweak it alittle when time permits. Alot of my job is programming trucks for tire/gear changes, and doing dyno/road tuning on gm cars (vettes, ta's and camaros) which are all virtually the same as the van. |
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Did they make a 3500 Express 4x4 Diesel? If so, what years were then available? thanks...gary |
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