Need help tuning

[shadowdrag]

I search and nothing matched up, but here. I just recently bought a new long block with new tranny, for the past 10k mile now, my car keeps throwing cell for P0304. I've replaced all sparkplugs, ignition coil, resistor pack, plug wires and nothing work. The dam dealership said that it is normal for the cell to come on since it is a new motor and just to drive it for couple thousand of miles. NOT, they only said that so that the problem can become mine and warrenty runs out. My car runs very nice and stronge and don't seem to misfire or cut out. My injector was just cleaned before the new motor was put in. HELP!!! cluelessWTF

I do have EPROM ECU on a 98 and I don't think its the ecu. I had it in for 1 1/2 years now. Not sure on this but, the dealer ship put in a 95 coil pack instead of a 98-99, but problem occurs with the old coil pack, this lead me to change it.

Can timing be a problem? I know when I first got the car, the belt was not tension right, it kinda squeeks. I went in after 2k mile and had it retension.

Thanks for any inputs.

 

[blcknspo0ln]

Okay so P0304 is cylinder 4 misire. Do you get any other cylinder misfires? Here's what I'd check:

Check that all of your spark plug wires are in good condition

Check your spark plugs and make sure they are properly gapped to .028"

Coil pack plug resistance : take a multimeter with big leads on it and put it on resistance setting and put negative and positive into therminals 4 & 1 and 2&3. If they are ~30k ohms you are ok. If they differ by a big amount, than a coil is shot on the coil pakc.

Check if plug locations are correct : 4-1-2-3 on the coil pack and 4-3-2-1 on the valve cover.

Check resistance on the transistor plug

Check base ignition; It should be 5* BDTC

 

[shadowdrag]

All that you mention below I have done many time already, but the base timing. I have no clue on how to go about doing this but my car runs as there was nothing wrong with it, boosts fine and pulls super stronge at higher RPM.. It seems to compare to but almost as stronge of a pull like my friends stock TT supra with all bolt on and 19lb of boost.

My last guess is the timing of valves, injectors, base timing or ecu. Just check boost leak and came out to none, only for that small pre exhaust leak at full boost.

Here this is the case, I zero out the cell with PDA and if I drive the car around no cell for as long as I drive it and not let it idle to long. But if I zero and let my car idle, the cell comes on with in 3-5 minutes.

 

[blcknspo0ln]

Ok, try swapping ECU's with a friend and see if that helps.