dustyH Posted August 31, 2008 Report Share Posted August 31, 2008 First, I want to admit that my automotive knowledge is limited. I've done some basic things as replacing wheel bearings, calipers, fuel pumps, ect... but this, I fear, is well above my experience level. With that said, any help with this will be greatly appreciated, Thanks. Some info... 94 deville, non-Concours 4.9 pfi (says on valve cover), non-northstar No noticeable sounds, poor performance, hard starting, ect. before problem Turn the key to ON and the dash monitor says "Monitored Systems Ok" Starter turns engine strong but does not start or seem to fire, like out of gas 30 amp ELC fuse in trunk keeps blowing The story is my wife parked the other day, after running fine, then several hours later tried to start the car, but it wouldn't. I tried it after a while, still nothing. Let it sit overnight, nothing. Some things that I've tried or checked... Replaced the fuel filter, nothing. Gas does come out of the fuel pressure test port when pressed, also checked it while cranking engine and does come out with more pressure. But I haven't the gauge to test if it has the right pressure. What is the correct pressure off and running? Checked one of the plug wires for spark (screwdriver in wire and 1/8" over front motor mount) and got what I thought was a small spark. Tried pouring a small amount of gas into the throttle body, nothing. Engine never fired at all. Checked all the fuses in the engine compartment, all good Removed the shroud over fuse area and checked the large fuses, all good. Two large fuses were solid 30s so I swapped places with two clear 30 fuses, nothing. Checked all the fused in the trunk, found the 30 amp "elc" fuse blown, replaced it, nothing. Had a mechanic friend (mostly a trans. mech.) come out. I wasn't there so I can't say exactly how and what he did, but he did say he found the same 30 amp ELC fuse in the trunk blown and a 10 amp blown. He swapped the fuses with a couple that were not important and still could not start it. I came home, looked as the trunk fuses again and the same 30 that I originally replaced, and he found blown and swapped out, I found blown again!!! The 10 amp he swapped hasn't blown again and he isn't sure without coming back out which one it was that had blown. He did say that the problem could be the timing gear skipped or broke a tooth. Would that not have made a noticeable sound when that happened? Not that my wife heard anything the last time it was started. He did scan the computer and only found a past code I think from several months ago when my battery died & I had it replaced. After seeing this in a forum, I did the warm air button/off button to check the codes, which had no PCM, IPC, ACP, or SIR codes. But it did lastly say "PCM?" It did have a question mark after PCM. Think that the PCM is the problem? How does that tie in with the blown fuses? Are they related? I've got to get some more fuses, once I do, and when I get the battery charged back up (from all the attempted starting) I"ll see one more time and see the the same fuses blow. This is my first post in a forum, hope I didn't go overboard but I know sometimes it's the smallest things that tend to make the most difference in diagnosing problems. Again thanks for any help. Link to comment Share on other sites More sharing options...
Ranger Posted August 31, 2008 Report Share Posted August 31, 2008 Fuel pressure should be 45-50 psi. Put a gauge on it and check it. 10 psi will spray as you checked but will not start the car. "PCM?" is asking if you want to enter the PCM mode. It is not indicating a problem with the PCM. Link to comment Share on other sites More sharing options...
dustyH Posted August 31, 2008 Author Report Share Posted August 31, 2008 Fuel pressure should be 45-50 psi. Put a gauge on it and check it. 10 psi will spray as you checked but will not start the car. "PCM?" is asking if you want to enter the PCM mode. It is not indicating a problem with the PCM. Thanks for your reply. Link to comment Share on other sites More sharing options...
adallak Posted September 1, 2008 Report Share Posted September 1, 2008 ELC - electronic level control had nothing to do with starting. How's the rear of the car? Not sugging? You either have a short in that circuit or your compressor is bad. I would not replace that 30A fuse yet. Cannot say anything about the starting problem... I would play with connectors to distributor. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
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