Constant Miss on #2 and Piss Poor Idle
#1
Constant Miss on #2 and **** Poor Idle
Just bought this truck last week, and I like to start from scratch so when I gave it an oil change I also did a tune up. Since then I have a miss on #2 and it has fouled 2 plugs. I replaced the cap and rotor on the distru, wires and plugs etc. Since then I get a miss at idle when warm. I replaced the wires again, had a warrenty on them and exchanged them, instaled the new ones and within 10mins I have the miss again and I pull the plug and they look like they have seen 100k. WTF is going on here? I have worked on several 302's in my old Stangs, but never had a problem carry over like this. And I must have done something because the tune up she didn't miss. Just a slightly rough idle, nothing bad.
btw: It's an auto 302 4x4.
Thanks,
John
btw: It's an auto 302 4x4.
Thanks,
John
Last edited by NIUPonyBoy; 07-22-2005 at 02:26 PM.
#3
#5
You really need to do the compression check. The reason you're getting a miss is most likely that you're not getting enough compression to give you decent combustion. The reason that throwing more ignition parts at it hasn't solved it is because it's NOT an ignition related problem; it's mechanical. Your dry compression on #2 is probably going to be something south of 100 PSI, not good. If youre very, very lucky, you're wet compression will be low as well. That means all you need is a valve job (I'd bet on a burned exhaust valve but I've been wrong before.) If your wet compression is good, you need to either re-ring the engine or get rid of the truck.
#6
#7
I did run some injector cleaner threw it but I also know tat stuff is not exactly the strongest stuff. As for it needing a valve job, I've never had one just stick after a simple job like a tune up, graned I've know what has been done to the old engines before and this is like a stranger in the bed but still. When I can I am going to get on it and do alittle more digging.
John
John
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#8
Alright turning in my wrenches...
I have replaced...
-cap and rotor for the distru
-plugs
-wires
-intake temp sensor
-thermo
-timing chains and gears
I still have the miss and the aweful idle. This didn't happen till I did the plugsand wires in the first place. The rest is tracking down the issue afterwards. WTF.
John
I have replaced...
-cap and rotor for the distru
-plugs
-wires
-intake temp sensor
-thermo
-timing chains and gears
I still have the miss and the aweful idle. This didn't happen till I did the plugsand wires in the first place. The rest is tracking down the issue afterwards. WTF.
John
#10
#13
same problem
i've got the same problem. trucks runs rough. i've mentioned it before. mine is a 93 also so i have the obd1. i get the two codes: "fuel runs rich" and "fuel runs lean." i've been told
1.) check for vacuum leaks
2.) check for bad fuel injectors.
the fuel injectors were apparently kinda easily broken on these models. mine "might" be stuck open on the #1 cylinder on my 300 I-6 because that plug looks way fouled.
i've checked plugs, firing order, distributor cap, timing, and plug wires. i've exchanged an oxygen sensor and the coolant temperature sensors (because they were both bad too). i've actually also changed out the plugs. (i put truck plugs in from champion....don't do that! they were horrible). it runs way better than it did, but it's still rough. i think the engine is getting too much fuel because there's an odd fuel-like smell. so i'm kinda giving creedance to the bad fuel-injector idea.
i don't own the fuel pressure guage to check for a bad fuel pump. otherwise i'd do that. i dn't know how much they cost. is there a way to test for a bad fuel injector without removing it?
1.) check for vacuum leaks
2.) check for bad fuel injectors.
the fuel injectors were apparently kinda easily broken on these models. mine "might" be stuck open on the #1 cylinder on my 300 I-6 because that plug looks way fouled.
i've checked plugs, firing order, distributor cap, timing, and plug wires. i've exchanged an oxygen sensor and the coolant temperature sensors (because they were both bad too). i've actually also changed out the plugs. (i put truck plugs in from champion....don't do that! they were horrible). it runs way better than it did, but it's still rough. i think the engine is getting too much fuel because there's an odd fuel-like smell. so i'm kinda giving creedance to the bad fuel-injector idea.
i don't own the fuel pressure guage to check for a bad fuel pump. otherwise i'd do that. i dn't know how much they cost. is there a way to test for a bad fuel injector without removing it?