1998 5.7 Vortec Ignition Problem - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-04-2008, 06:47 PM
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1998 5.7 Vortec Ignition Problem

So i finally got my 1998 Silverado back together (all stock) and went to start it today. It cranks and gets fuel, but no spark. I have triple checked all the connections and found one connection unplugged, but no where to connect to. I believe it is a part of the oil pressure gauge because there is a choice for a three terminal or one terminal pressure switch. I had the three and thats what i got, but it doesnt fit into the block so i dont have it hooked up yet. On the wiring diagram i found that the wire that is unhooked it the one terminal option for the oil pressure switch, or so i think. I'll include a link to the diagram. It is the orange wire that leads to the fuel pump relay. All of the fuses are fine btw.

Anyway, all that aside i still dont have any spark. I bought a new coil and it didnt do anything. My next guess would be to buy a ignition module. But its expensive and am just wondering if anybody sees something that i'm overlooking.

Heres the link. Click on figure 4 for the engine wiring diagram. Thanks for any help.
http://www.autozone.com/shopping/rep...00c1528008f3ce

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Last edited by mightycarlo10; 07-04-2008 at 06:54 PM.
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Old 07-04-2008, 06:51 PM
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Wait, i think i see my mistake. That wire connects to the ECM B fuse. Could that cause my problem?
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Old 07-05-2008, 10:41 AM
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What kind of distributor does it have. I would guess you have a connection missing somewhere.
Why and how far did you have it apart. The more information you give the easier it would be to help

Chet
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Old 07-05-2008, 04:10 PM
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I pulled it apart because it dropped a valve and it split a piston in two. So i went ahead and replaced that along with bearings, rings, timing chain, oil pump, etc... so it was down to a bare block. It was a part for like a month or two. It is just the stock distributor (http://www.autozone.com/R,APP39635/v...ductDetail.htm. I checked to see if it was contacting the terminals and stuff and it seems to be.
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Old 07-08-2008, 05:51 PM
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So i finally got it to spark, but it is barely visible. I tried a new coil and that didnt help. I tried new plugs, and the old plugs that were in there. It was the same. There's 12v to the coil and to the ignition module. It seems like the spark is brightest at first and then gets smaller as you crank on until its gone. It seems like the coil is just not keeping up or something. The new coil i put in was doin the same thing so I have no idea what is happening. Anyone who has some much needed advice, it would be greatly appreciated.

Last edited by mightycarlo10; 07-08-2008 at 07:09 PM.
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Old 07-10-2008, 06:35 PM
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Anybody??? I tried a ignition module tonight and that didnt help any. This is startin to really annoy me.
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Old 07-18-2008, 08:25 PM
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when you reinstalled the engine did you clean and hook up all the engine and body grounds.?
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Old 07-19-2008, 07:13 AM
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I figured it out. I walked by my workbench and happened to notice the plate that the crank sensor reads lying on the bench. So i had to pull it all apart again and put it in. Real stupid mistake but it runs real nice now.
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