Bad times with my new engine - Subaru WRX Forum
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post #1 of 2 Old 08-07-2008, 11:48 PM Thread Starter
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Bad times with my new engine

I posted this earlier at the bottom of my thread about finishing my rebuild, but I thought I might get more replies with it's own thread, sorry for obnoxious repetition. I made it to 176miles on my new engine before it threw a code. P0303 and P0300. Great!

Here's the deal, I've mentioned like 100 times that my car has had a hesitation issue since day 1. It was purchased as a stage 3, and I've spent $7000 fixing things that were done wrong so far.

This heitation got way worse when my #4 piston broke. I'm not sure if this(a misfire) was the problem all along that was causing the hesitation, but I got the same symptoms, just way worse. It bogged down hard occasionally when I tried to accelerate, and it had to turn over 4-6 times before firing up.

4 months later I have a rebuilt engine, and the same symptoms. It ran PERFECT until today. It fired right up after we dropped the engint in. No codes, no hesitation. I've been doing a soft to medium break in, definately keeping my foot out of it. Then it threw the mis on cyl 3 and a multiple mis. It bogs down before acceleration(sometimes), it has to turn over 3-4 times before it will start.

I took it to my tuner. It is not mechanical. SWEET! He threw his tester on it, and for like 30 seconds after start up, it was correcting the fuel -23%. Then it just stopped and leveled out, reading fine. Whatever it is, it's sporatic. EXCEPT- it won't fire right up. It still takes 3-4 turns almost every time. Occasionally it will fire right up first crank.

My tuner wants to throw a closer map on it to see if it helps. He said it's not all the map, but it is a crappy map and it could be part of the problem. He also said it looked like they didn't compensate the fuel under initial acceleration, which is possibly where the hesitation comes from.

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post #2 of 2 Old 08-08-2008, 10:01 AM
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Sounds like good advice from your tuner there...

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