ok I got a 97 ek hatch with a jdm b16a, wired with a 96-98 automatic ex harness. everything is wired correctly to my knowledge, and the plugs/wires,dist., fuel filter, tps, IACV, and injectors have all been changed to try and fix this problem.

When ever the car is first started, say in the morning, or after its been sitting and the engine has cooled off. You start it and try to drive, and it like runs very rich/bogs and will even backfire. It barely moves, unless you kinda push the gas peddle in and out it'll pick up if you are heavy on it and go. This continues until it reaches the normal temp.

Then once it warms up it drives amazing... for about 30 mins. Then it just looses a ton of power out of nowhere, doesn't sputter or anything, just seems to loose a shitload of power, mostly midrange, the vtec end is still strong but no where near as good as before.

Could it be the main relay? Should I get a 5spd harness? I'm pretty much out of ideas here... any help is appreciated. Thanks in advance.

 

Oh and I'm shooting no codes whatsoever. ECU is a phareable chipped p28.

 

no one?

 

Your ecu, the chipped P28's are notorious for rough surging idle on cold starts. It's also probably causing your vehicle to run too rich. Have you tried running a matching ecu like an OBDII P30 B16A SIR ecu? Or even an OBDI P30 would do.

Check your timing belt also and distributor, both can be causes of a weak motor. A compression test would also be a good idea...

 

I had an auto p30 before... (hmotors sent me one for some reason with the swap) still ran like poopy. I'm gonna try the main relay soon, and I have another dizzy I guess I'll throw it on and see if it helps...

 

I guess I'm the only person who's ever had this problem? Throughout all my searching I've still found nothing/had several shops check it all out and can't figure whats wrong with it...

 

I dropped in a gsr into my eg and its doing the same thing. I bought a tps sensor online. Gonna see if that helps. I replaced the ignition and almost everything. Replaced mapping sensor, fuel pressure regulator, spark plug wires and plugs, rotor and cap and ignition, and plugged up the brake booster hole and tried a dozen different things to try to stop vacume leaks and its still the same. Tried 2 different o2 sensors and it was the same. Compression tested it and all cylinders were at 210 so its not the headgasket. I also have a phareable ecu but i don't think its that since you already tried another one. I think its one of the sensors i haven't replaced my tps yet. If that doesn't work its probably the injectors since i'm still using my d16z6 ones. They should be the same cc's as a gsr. My fuel pump pumps around 38psi shown from the gauge. I think its a sensor problem most likely. I retimed the belt like 10 times already and its still the same. Hope the sensor works for me.

It just keeps bogging and sputtering out gas it looks like. I checked the spark plugs and its running really really rich. Practically flooding the system with gas. I put my hand at the exhaust and i saw it was shooting out gas on my hand. Reseated the head to. Checked for anything on the block that had holes or anything. Resealed the black box chamber on the back of the block and put a new pcv valve on it and tested it. Tried 2 different throttle bodies from my old d16z6 and a gsr one. I think my d16z6 ran rich to so i think it might be the tps sensor. I never was able to change that on my old engine since the screws heads were ripped off. Since i have a jdm throttle body i can take off that sensor. I heard it gets damaged during shipping. I think it might have been damaged or something. I tried so much stuff. I spent this whole week doing nothing but being under the car and testing and testing for new things to work and it seems like this is my last shot i have lol. I am running out of ideas already. I was thinking of taking it to a shop but i know they would probably not find anything wrong and it would just be a waste of money. Not getting any error codes at all either. Its wierd lol.

What do you guys recommend doing


Modified by stealth50k at 1:23 AM 2/7/2007

 

I fixed it practically now. It use to idle super rough and like crap with sputtering and everything and now i finally fixed it. I ended up buying a password jdm intake plastic gasket and i had a extra sensor for the thermostat housing and i put new sparkplugs in and now its idling in the range it should be around 600-800 with no roughness practically. I just need to figure out why its fluctuating some and when i press teh gas it goes to almost 0 rpm. Finally i got the roughness out though .

 

way to bump up ayear old thread

 

I fixed my fluctuation in the idle now. It doesn't drop to 0 now. It was doing it since my power steering hose and resevoir weren't connected.

Main thing to look for if you bogging on a cold start is vacume leaks and unconnected parts and hoses.

The only thing thats alittle off is when i push the throttle sometimes when driving it boggs. Have to check to the tps sensor to see if its reading the right voltages. Hope this helps someones problems