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Old 05-22-2020, 04:40 PM   #1
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Default EGR tube removal causing misfire?

Alright so this might be a bit long. Back like 7 years ago I bought my 96 hardbody. It had a bad exhaust leak at the manifold so I took it to a muffler shop to have a new exhaust manifold put on. When they did this they ended up cutting and removing the EGR tube (among other things but I believe I have rectified those). Anyway fast forward after several years of not being able to pass an emissions inspection and I'm trying to get this truck back to running right without having to cheat the system and spend $200 a year for them to tell me its messed up. Within the last week or so it developed a pretty significant misfire around the lower RPMs. Ive been through this up and down trying to chase it but everything seems fine until I cut it on. I'm wondering if the cut EGR tube is causing this problem as well as a p1130 CE code. I'm planning on replacing the exhaust system myself this time but if the cut tube is what the problem is then Ill have to move up my timetable for that
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Old 05-23-2020, 12:34 AM   #2
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P1130 is the Swirl Control Valve. I'm not sure what it is or if it is a part of the EGR system, though. I don't think my V6 has one.

For the misfire, have you confirmed that your Ignition Timing is properly set to 14?
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Old 05-24-2020, 10:07 AM   #3
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One or more of his injectors are bad, I'm willing to bet
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Old 05-25-2020, 08:02 AM   #4
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Quote:
Originally Posted by Chuckles View Post
Alright so this might be a bit long. Back like 7 years ago I bought my 96 hardbody. It had a bad exhaust leak at the manifold so I took it to a muffler shop to have a new exhaust manifold put on. When they did this they ended up cutting and removing the EGR tube (among other things but I believe I have rectified those). Anyway fast forward after several years of not being able to pass an emissions inspection and I'm trying to get this truck back to running right without having to cheat the system and spend $200 a year for them to tell me its messed up. Within the last week or so it developed a pretty significant misfire around the lower RPMs. Ive been through this up and down trying to chase it but everything seems fine until I cut it on. I'm wondering if the cut EGR tube is causing this problem as well as a p1130 CE code. I'm planning on replacing the exhaust system myself this time but if the cut tube is what the problem is then Ill have to move up my timetable for that
It is much more likely that something ELSE is causing the misfire. The reason is because if the EGR was going to cause a misfire, it probably would have done it right away, after the tube was removed. It wouldn't wait years to do that.

Here is a general, all-around hint on ignition misfires:

If the truck only misses at high-speed freeway travel....look to a fuel delivery problem. Pump, injector maybe, or fuel filter.

If the truck only misses under a load, like going up a very steep hill....look to distributor, distributor cap, spark plug, rotor, plug wire, coil, or the like.

If the truck misses at idle, chances more likely it is the same problem as the 'under load' things, or you have a vacuum leak. These are not absolutes, but they work for diagnosis if the miss is under those certain conditions. In other words, IF it only misses under load and not anywhere else. Or IF it misses ONLY at high speed travel. If the miss is consistent everywhere, could be any of those things listed except maybe the fuel pump. A bad pump or fuel filter will not usually cause a miss at idle, but only at higher speeds.
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Old 05-26-2020, 01:40 PM   #5
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I've got the older VG, but I removed the EGR stuff from my truck back when I first got it and it hasn't had any issues. I had some stumbling in low RPMs many years ago and the problem ended up being a bad ground wire in the engine bay. Unfortunately I don't remember where it was. It took a while to track it down.
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Old 05-26-2020, 03:10 PM   #6
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I've got the older VG, but I removed the EGR stuff from my truck back when I first got it and it hasn't had any issues. I had some stumbling in low RPMs many years ago and the problem ended up being a bad ground wire in the engine bay. Unfortunately I don't remember where it was. It took a while to track it down.
I think the emissions on the newer Hardbodys prevent EGR removal.

I'm not 100%, though.
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Old 05-27-2020, 09:03 AM   #7
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I think the emissions on the newer Hardbodys prevent EGR removal.

I'm not 100%, though.
Well, I wouldn't try it on a 96 or 97 model, that's for sure. Those years have the code reader plug-in near the fuse box. You start screwing with the emissions on those late-90's trucks, you are just asking for trouble. You have to watch out what you pull off, or what you mess with, because it can cause other problems to pop up. It's a symbiotic system, as they say. Some things rely on OTHER things to do their job, keep working, and not toss you unnecessary CEL codes. Sometimes trying to bypass or remove certain things on the late model trucks is like a neurosurgeon trying to remove a small tumor from your brain in a real tough place to reach.

In other words, even if he succeeds, other stuff will probably get screwed up anyway.
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Old 05-27-2020, 07:22 PM   #8
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You can pull the emissions off ODBii vehicles, just need to do some work after. I had to put a piggyback on the ECU of the yaris and used a AEM F/IC to adjust the fuel and timing. Never had any CELs on it.
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Old 05-27-2020, 08:44 PM   #9
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I can agree with that.

When I removed the CATS from my 2012 Altima, I was able to message the O2 sensor bugs so that the CEL would turn off.
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Old 05-28-2020, 03:27 PM   #10
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i deleted my EGR system and plugged the bung on the header and intake. i dont have any codes popping up but then again i havent really driven since the DOHC swap. im still battling leaks after a fresh rebuild. leaking from powersteering return line, oil pump bolts and something is leaking between the trans and engine....but i changed that rear main seal.....ugh
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