Multiple Check Engine Light DTC's Diagnosis- PART 1
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- เผยแพร่เมื่อ 31 ธ.ค. 2024
- Home mechanic using a systematic, diagnostic approach to solve simultaneous P0115, P0141, P0130, P0133, and P0340 on a recently purchased 1996 Toyota Camry with a 2.2L engine. EGR Code is diagnosed in this part.
Good question Spelunkard. On most models the other end of the EGR vacuum goes to a an electrical EGR Solenoid on the intake which is computer controlled to open/close and allow the vacuum only at the right engine conditions. The hose of course is never directly connected to manifold vacuum for the reason you stated.
If only all repair mechanics had the same attitude about saving there customers money .
+Randy Ingrao Well the difference is I am not a mechanic, this is my hobby so my motivation is different
Okay, that was the first EGR repair that made sense to me. So simple, maybe that's why others skipped over the detail as easy in their videos, lol.
Thats funny you brought up about doing those voltage drop tests on the wires going to the fuel pump. We always skipped it and assumed the wires were good and call it a bad pump. Brings back basic auto theory 101.
gc I did the same for years because I never took the time to understand voltage drop... until I made a wrong call on a no start. Called a starter when it was actually a bad cable. It was only then that I realized how lucky I was in years before not considering it as a possibility.
Another excellent video, Matt. Where does the other end of that vacuum hose go? I thought manifold vacuum was most negative at idle, almost zero at WOT. So, you want the inverse of manifold vacuum....
Great videos. I thought the function of the EGR system was to recirculate exhaust gas to cool the engine and reduce nitrogen oxide emissions. This process, I thought, was to make the engine less efficient and promote improved emissions.
Yes that may also be an effect of EGR- I have heard of this but I honestly am not sure. There is a lot of debate in the "free performance mod" arena. One school of thought is because exhaust gasses are really hot- hundreds of degrees, EGR would increase the incoming air temp dramatically- the exact opposite of what you want for performance and it would raise engine temperatures (but I doubt EGR is active at wide open throttle anyway). But the mod of course is to bypoass the EGR because of this thinking. The other school of thought agrees with you- at least as far as the cooling effect, and would insist you do not want to bypass it. I really wish I had a gas analyzer because I would love to do videos testing such "free mods" and finally putting to rest these debates.
Schrodingers Box
Working on the ACE test made me feel better about the purpose of the EGR system. I think it's more to keep the engine running cooler than anything else. The reason being is that most of the combustible gases have already been burnt so it's basically a fuel-less input.
The EGR does in fact cool the combustion temperature by pumping burnt air back into the intake. By lowering the burnable air mixture in the chamber you cool the combustion temperature and therefore reducing NOx emissions and photochemical smog.
Sweet km very grateful thanxs. The best info that I could actually relate to and could do myself. The Girltim.
I was about to crap myself when you said you got TA for 800!
Hahaha how come no one else got that??? I thought it was hilarious!
+Schrodingers Box it was! LOL I love watching your videos Matt, I always learn something new (or learn a better way of doing it) and as a bonus I always laugh! I appreciate clever humor
$1500 cars make good winter beater
oh absolutely!!! They also are great training grounds for diagnosis and repair. I learned most of what I know on cars under $1000.
i think the car was only worth 700