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Thanks to everyone for the help and great documentation, but after putting the whole thing back together, i have a no start condition that may have me throwing in the towel. Cranks for a bit..trying to turn over. then i heard a POP almost like a backfire. Pulled the plugs and they were wet...

So next step I'm guessing will be to fix the tensioner, then put the crank to TDC and manually adjust the cams into position?

I'd say the timing might be just a little bit off. Turned to TDC twice and didn't get the marks to line up anywhere near where they were when I installed it. I'll post pictures of the belt tensioner on my next break. https://photos.app.goo.gl/Xt4RPamHDt3AQ4QS6

I'm going to go pick up a new sensor, and tension spring, then pop the valve cover and take a look. I did all my marks from the passenger side and never knew to look for the marks from the drivers side! That is a great tip. are those two marks enough or do I also need to pulll the crank pulley...

This is a long shot.. but it won't hurt. 2003 protege5 206k. Radiator died and replaced it then water pump died (water out weep hole) so I went in to swap it. Pulled all the parts and replaced the pump, timing belt and tensioners. Also did the alternator because it decided to seize. I put...

2003 Proto5 PreCat removed and replaced with Headers, Coils, plugs,MAF, EGR all replaced, This beat the p0421 /p0300 that it was throwing, but it was still sluggish. Daughters BF finally got the EGR tube hooked up to the headers and it ran great for several months, the hesitation was all gone...

If was clearly the connection between my distributor and my retro encabulator. https://youtu.be/RXJKdh1KZ0w Sent from my SM-N920V using Tapatalk

The coils are Beck Arnley 178-8310, and the wires are ngk. Sent from my SM-N920V using Tapatalk

Okay. . How does one test an ect? Sent from my SM-N920V using Tapatalk

Update: It warmed up to almost 30 degrees today. It fought me for a few seconds, and then started right up. Fyi the only difference is a new battery and 40 degrees warmer. I'm thinking there is some water in the fuel line perhaps? Sent from my SM-N920V using Tapatalk

Tried pulling the O2 sensor this afternoon. No change. The battery was old so I went ahead and replaced it. I put a test light on cylinder 1 and verified spark, but still no start. Here is the video https://youtu.be/v3PXdt3qTq4 next stop is fuel pressure testing, but I will need to...

My commitment to getting this car running is in direct relation to my desire to not play chauffer to my 16 year old :) I'm going to chew on the last that PCB posted and see what I can find. I'm also going to drop a new battery in this. It tested okay, but it's 4 years old and as I might of...

It had been removed to try a bit of starting fluid. Sent from my SM-N920V using Tapatalk

2003 protege5 186k Battled the familiar misfire p0300 and p0421 issue (non fouler is awesome!) and jacked up the cats in the process. I dropped new coils, plugs, wires, and EGR and the car runs good, except for the hesitation due to the clogged cats, I ordered a new exhaust header and mid pipe...

Just did new coils today. Almost no power for a few moments when leaving a stop, then it picks back up and seems to run Okay. Does that indicate a possible vacuum leak? Sent from my SM-G900P using Tapatalk

I have the same p0300. Usually after slowing the car down and showing in a serious misfire / loss of power. Pull over the car. Lift the hood and pull one of the plug cables a bit so it archs against the block. The misfire clears and it runs like a top for a while. Rinse and repeat. Why...

And the error code is BACK!! grumble Problem Description: 2002 Mazda Protege5 2.5L 180K The issue is always seen when driving slowly after a period of driving, usually over 55mph. Car starts to miss on what feels like multiple cylinders. There is shaking of the vehicle when this happens CEL...

After a long hiatus of the car sitting in the garage I got the EGR swapped out. DRASTICALLY improved the issue but i've driving it around a bit since then and I still have an occasional rough idle and P0300 code when I slow down to idle. the P0421 code is there as well, but I just haven't...

The non fowler trick is in the plan. Going to return the precat I bought. I'm more concerned work the P0300. Going after the EGR valve. Going to see if I can clean it. Sent from my SM-G900P using Tapatalk

Just wanted to give a thumbs up to the folks on this thread. Just picked up a Protege5 with 185K on it with 0300 and 0421. P0300: Coils, plugs and wires didn't fix the 0300 so I'm going to aim for the EGR valve and see what happens. P0421: I know the very non mechanical guy that sold it to...