My old 94' Lumina Z34 DOHC ..It's been sitting up for about 8 months and just got it Legal and cleaned up and ready to roll. Took it out yesterday and everything great just as when i parked it last. Today however, went for a ride and didn't get 1/16th mile and was kinda jumpy with low power so pulled over right away. Did not even get up to 35mph. Anyway opened hood after it did not want to start, and got my son to turn key while i looked around. It tried to start but would not, and Backfired through Intake Manifold... I guess my question is whats the odds that the Timing jumped? I personally replaced Timing Belt myself w/help from this site around 60,000 mi. ago. I would have replaced again earlier but health problems got me. Car has 200,550 mi. on it. Any answers or comments/ideas from you guys will be most appreciated. Thanks, Paul
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Timing question - with backfire
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Question : Timing question - with backfire
94 Lumina Z34
Moved Wife & Kids Out So I Could Have More Room To Park Z34 In Livingroom.Tags: None
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Yea, i knew i was pushing my luck with that Belt, but my illness, Cancer, that i am now free & clear of left me with no energy to do anything...I feel 99 years old...lol..But now i got no choice, disabled for the most part & broke, can't buy a new one...going outside in a few and pull that cam cover and take a look.94 Lumina Z34
Moved Wife & Kids Out So I Could Have More Room To Park Z34 In Livingroom.
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Schurkey, i don't even know how to check compression, not much of a mechanic, and i would think it is getting spark or i would not have heard backfire, i think...i did replace wires, spark plugs, and coil pack not too long ago w/quality stuff..a/c Delco not too long ago so i think good there. Was wondering would bad gas make it not crank & backfire, even though took it out yesterday and drove like a champ on that same gas. Just wondering if Computer or fuse or whatever else might give it signs of Timing off?94 Lumina Z34
Moved Wife & Kids Out So I Could Have More Room To Park Z34 In Livingroom.
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Removed Cam covers and belt looks very good..no cracks and still thick. I then went to replace fuel filter and drain any old gas out. The thing is i took filter off and just a few drops of gas came out, and that was under pressure, as i did not relieve pressure first like some do. Anyway i then with the fuel filter still off and line open, turned key thinking fuel pump would blow out gas in the tank. But nothing? I then replaced the fuel pump relay and still nothing. Question is shouldn't fuel have sprayed out of the line from tank when i turned motor over for about a minite or so. Does this sound like Bad Fuel Pump and are they a bitch to change as i have no idea? Thanks for any help...94 Lumina Z34
Moved Wife & Kids Out So I Could Have More Room To Park Z34 In Livingroom.
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Originally posted by RollinonZ34 View Postwith the fuel filter still off and line open, turned key thinking fuel pump would blow out gas in the tank. But nothing? I then replaced the fuel pump relay and still nothing. Question is shouldn't fuel have sprayed out of the line from tank when i turned motor over for about a minite or so. Does this sound like Bad Fuel Pump and are they a bitch to change as i have no idea? Thanks for any help...Originally posted by Schurkey View PostFor that matter, what is fuel pressure
You should have been showered with gasoline.
Time to diagnose the fuel pump electrical circuit. Could be as minor as a popped fuse; could be defective wiring, could be a defective pump, could be...lots of things.
Doing the PROPER method for fuel pump replacement means dropping the fuel tank. Some folks have decided that it's a better (???) plan to chisel a hole in the trunk and pull the pump assembly from above. Then they somehow "repair" the access hole.^ some people may call this guy an asshole at times, but he isn't wrong very often -- Robert
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Schurkey, i agree with you totally... I am trying to pinpoint as easily and cheaply as possible. I did replace the fuel pump relay, but that did not do it. I for the life in me cannot find the Fuse though? Only thing i saw was in glovebox and at bottom it did have a slot for fuse and said Fuel pmp. i think it was, but no fuse was in the empty slot. and not even any copper siding in it to hold fuse and make circut? Anyone know where that Damm Fuse is for the Fuel Pump Please let me know ASAP...There has just got to be one somewhere.. Thanks again,94 Lumina Z34
Moved Wife & Kids Out So I Could Have More Room To Park Z34 In Livingroom.
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There are 2 boxes with fuses and relays under the hood.. 1 is near the coolant tank,, you have to pull the diagonal brace to get at that one.. Another should be right around the positive aux connection.... That's how my 99 Lum is.... The 93 Z34 is covered up and I haven't looked at it in a while, but, I think it's the same.... Check out a manual....
Good Luck,,,
Tom....
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A quick look at a schematic only shows relays for the fuel pump under the hood, no fuses... Sorry...Last edited by walterdude; 06-03-2011, 01:30 PM.
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Well i did finally find Fuse, it is on passenger side over computer, and the Fuse is marked ECM BAT is a 20 Amp fuse and feeds many things. I guess the hunt is on now with wiring to the tank...got my fingers crossed as i do not want the hassle of dropping the gas tank - do not know how to replace pump, and also what to replace, just the pump or the screen, any gaskets or o-rings, etc. and also the money to replace it all. And don't worry Schurkey, not gonna cut up the trunk to access, unless i run into major problems doing proper way, that is after i find out the proper way....lol.. Thanks everyone for input.94 Lumina Z34
Moved Wife & Kids Out So I Could Have More Room To Park Z34 In Livingroom.
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If it comes to the pump, you replace the sending unit. It has the pump in it, along with the screen (or should at least. if you replace the pump, replace the screen as well) and the big o ring around the sending unit will come with the new one. Some do come with a new pigtail to splice into current wiring.-60v6's 2nd Jon M.
91 Black Lumina Z34-5 speed
92 Black Lumina Z34 5 speed (getting there, slowly... follow the progress here)
94 Red Ford Ranger 2WD-5 speed
Originally posted by Jay LenoTires are cheap clutches...
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Originally posted by RollinonZ34 View PostWell i did finally find Fuse, it is on passenger side over computer, and the Fuse is marked ECM BAT is a 20 Amp fuse and feeds many things. I guess the hunt is on now with wiring to the tank...got my fingers crossed as i do not want the hassle of dropping the gas tank - do not know how to replace pump, and also what to replace, just the pump or the screen, any gaskets or o-rings, etc. and also the money to replace it all. And don't worry Schurkey, not gonna cut up the trunk to access, unless i run into major problems doing proper way, that is after i find out the proper way....lol.. Thanks everyone for input.
BEFORE you drop the tank, find the wiring harness and do the electrical tests.^ some people may call this guy an asshole at times, but he isn't wrong very often -- Robert
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I did electrical the best i knew how. I found and disconnected the harness or plug where it goes into the tank. I then took an ohm metter and checked for continuity. There were 4 wires 1 purple and 3 black i think. Checkecd by putting 1 lead on purple and then other lead on the other 3 one at a time. I had closed circut on just 1 set of wires, and nothing on the other two. I am guessing that since my fuel guage still workes properly that that was the good pair, and the other was open circut or bad pump. I hope this was correct as i could not check for Voltage as i am by myself in the stix and had no one to turn key while i was under car with meter. So correct or not i went ahead and ordered Pump w/sending unit. Thanks Pocket Rocket for telling me about get sending unit as it comes with Pump/filter and everything needed for the job. I ordered it (spectra premium) from Rock Auto, and it costed about the same for whole kit as just the Pump i was looking at to buy. Once again, this site is "The Best" @ helping with these cars and 3.4DOHC on the net! Also, thank you Schurkey for info, i did also order big o-ring and round bolt or whatever it is called that you turn on top of tank to remove assembly, but ordered that at nearby Autozone for much cheaper..no S/H. Thanks again for info as i still need to do the dirty work and drop the tank...not looking forward to it as i am fairly handicaped and very difficult to do things anymore, but i will get it done in baby steps if needed...lol...Any more advice, please chime in...Much appreciated..94 Lumina Z34
Moved Wife & Kids Out So I Could Have More Room To Park Z34 In Livingroom.
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