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Car Forum / Driving, Maintenance, Tuning / General Car Topics / May 2005LeSabre doesn't start
94 Buick LeSabre - New Spark Plugs and Wires - New Crankshaft and Camshaft Sensors - Replaced Ignition Module and Coils with used working ones - Tried Computer from another LeSabre (same number) Switching PROM - Fuel pressure OK - Compression OK on all cylinders - Don't see any vacuum leeks - I see spark and Injectors spraying But doesn't start! It turns but no signs of starting. Any help would be appreciated. Dominic > 94 Buick LeSabre > [quoted text clipped - 12 lines] > > Dominic ____________________________________________________________________________ ___ > Posted Via Uncensored-News.Com - Accounts Starting At $6.95 - http://www.uncensored-news.com > <><><><><><><> The Worlds Uncensored News Source <><><><><><><><> Sounds like you have 2 of 3 components to start--fuel & spark. Now, see if you have compression--test w/a compression tester to ensure adequate comp. If this test passes, then 'back to the grindin' stone". BTW: ADEQUATE fuel pressure is needed, not just fuel press. Same goes for spark. Nothing beats an analyzer/tester via ldl-socket. s >> 94 Buick LeSabre >> [quoted text clipped - 27 lines] > spark. > Nothing beats an analyzer/tester via ldl-socket. s Compression is (#1 to #6) 170, 165, 170, 150, 150 and 136 psi. Fuel pressure is 42 psi. The Ignition Module and Coils I tryed, work fine in the other car. The car worked fine before it went bananas. >Compression is (#1 to #6) 170, 165, 170, 150, 150 and 136 psi. Fuel pressure >is 42 psi. The Ignition Module and Coils I tryed, work fine in the other >car. The car worked fine before it went bananas. The compression numbers are acceptable, #6 is a tad low, but won't keep it from starting. Are you sure the injectors are working? Did you try a noid light on them? Do the plugs smell of fuel when it won't start? A bit closer to solving the problem. If I spray starter fluid into the intake it will try to start. But I measured the fuel pressure again while cranking and it stays at abou 45psi. I don't have the Noid Lite. I went to two auto parts place and they didn't have it. >>Compression is (#1 to #6) 170, 165, 170, 150, 150 and 136 psi. Fuel >>pressure [quoted text clipped - 5 lines] > try a noid light on them? Do the plugs smell of fuel when it won't > start? >A bit closer to solving the problem. If I spray starter fluid into the >intake it will try to start. But I measured the fuel pressure again while >cranking and it stays at abou 45psi. I don't have the Noid Lite. I went to >two auto parts place and they didn't have it. It looks like the injectors are not firing. Try Northern Auto Parts (online) and they should have noid lights. Have you done a scan of the ODBI system to see if any codes are being set? >>A bit closer to solving the problem. If I spray starter fluid into the >>intake it will try to start. But I measured the fuel pressure again while [quoted text clipped - 4 lines] > (online) and they should have noid lights. Have you done a scan of the > ODBI system to see if any codes are being set? No codes given. This car is not ODBII yet, but I have the ScanTool. When the car was still running but hesitating already, it set the code for the EGR. I reset the codes them and it didn't came back. A few day later it stopped completely but no codes. I just tested the injector's harness with the Noid Lights and none of them as a pulse. What could be causing that? >>A bit closer to solving the problem. If I spray starter fluid into the >>intake it will try to start. But I measured the fuel pressure again while [quoted text clipped - 4 lines] > (online) and they should have noid lights. Have you done a scan of the > ODBI system to see if any codes are being set? >I just tested the injector's harness with the Noid Lights and none of them >as a > pulse. What could be causing that? This is getting confusing. :-) The car is back to the old problem. The not starting condition was a fuse under the dashboard next to the globe compartment. Now that it starts, if does what it was doing before, which is, cylinder 5 and 6 misfire. But 6 more that 5, sometimes it's the other way around. Rarely, 2 also misfires a little. Where I see the misfiring it's with my ScanTool. If I listen to the injectors with a stethoscope I hear them clicking and they never miss. When I looked at injector it sprayed. If I remove the spark plug wire and test it looking at the spark, it never fail to spark. But I feel the engine running rough. I switched injector 6 with another and no difference. I also switch spark plugs 5 and 6 with others and no difference, still 6 and 5 misfire the worst. Could the EGR or other sensor cause this to happen? - New Spark Plugs and Wires - New Crankshaft and Camshaft Sensors - Replaced Ignition Module and Coils with used working ones - Tried Computer from another LeSabre (same number) Switching PROM - Fuel pressure: 44 psi - Compression on 1, 2, 3, 4, 5 and 6: 150, 170, 150, 165, 135, 170 - Don't see any vacuum leeks >This is getting confusing. :-) The car is back to the old problem. The not >starting condition was a fuse under the dashboard next to the globe >compartment. Now that it starts, if does what it was doing before, which is, >cylinder 5 and 6 misfire. But 6 more that 5, sometimes it's the other way >around. Rarely, 2 also misfires a little. the 5 and 6 problem could be anything, really. The lower compression in 5 might be a factor (I don't think so, if it was under 100, yes, but 135 should be OK) Run it for a while (week or so) if you can, and then pull the plugs. Do 5 and 6 look the same as the others? (same color and deposits?) New plug wires, right? What about the timing chain loose or worn out? >>This is getting confusing. :-) The car is back to the old problem. The not >>starting condition was a fuse under the dashboard next to the globe [quoted text clipped - 8 lines] > then pull the plugs. Do 5 and 6 look the same as the others? (same > color and deposits?) New plug wires, right? I did an expriment. I disconnected one injector at a time and cheched which cylinders missfired with my ScanTool. Here are the results: #1 disconnected ---> #2 misfired #2 disconnected ---> #1 misfired #3 disconnected ---> #6 misfired #4 disconnected ---> #5 misfired #5 disconnected ---> #4 misfired #6 disconnected ---> #3 misfired (and #2 a couple of times) I checked the spark plug wires and they connect each coil to the right spark plug. The tool, when you press the key to start recording, it reads data for about 9 seconds, plus about 5 seconds from before, and plays it back in 13 frames taken about, more or less, 1 second apart. Then I can scroll up and down through it. Besides the usual error 300, ramdom misfiring, today I also got the error 406, pindle position error, EGR. >I did an expriment. I disconnected one injector at a time and cheched which >cylinders missfired with my ScanTool. Here are the results: [quoted text clipped - 16 lines] >Besides the usual error 300, ramdom misfiring, today I also got the error >406, pindle position error, EGR. I'm basically out of ideas... (Sorry) but as someone else suggested, check cam timing. Your missfire experiment was interesting, consider trying it on a vehicle that is running OK, and see what results you get. Swap #1 injector with #3. Swap #2 injector with #4 see what happens... > I did an expriment. I disconnected one injector at a time and cheched which > cylinders missfired with my ScanTool. Here are the results: [quoted text clipped - 16 lines] > Besides the usual error 300, ramdom misfiring, today I also got the error > 406, pindle position error, EGR. Since you obviously enjoy experimenting(as do I) and since you have a quite similar car to try parts from, you might try swapping the plug wires. Assuming you bought after-market new wires for the Buick, they may be defective. Seen it happen more times than one when buying new, other-than-GM wires. Won't cost anything other than your time; and it might just solve your dilemna. HTH as I've seen it do for others' cars. s >94 Buick LeSabre > [quoted text clipped - 4 lines] >- Fuel pressure OK >- Compression OK on all cylinders What is the compression? Give the numbers for all cylinders. When you pull the plugs after trying to start, do they smell of gas? Nice to have spark, but is it coming at the right time? |
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