thirsk66

iTrader: (2)

I have a 98 Prelude with an h22 euro-r swap in it, with a p28 chipped ecu and Rosko racing two wire iacv adapter plate. Since I have done the swap 2 years ago I have had this hard starting issue, sometimes it will happen when its cold or already warmed up. I have been chasing my tail trying to figure this issue out. It will start and then immediately act like it is bogged down and start idling anywhere from 100-300rpm, or just turn itself off all together. I am wondering if it is due to my iacv like I need a new one, or this has to do with a different sensor, or a tuning issue. I am really wanting to know why this happens in the first place. Any help/ ideas on this issue would be awesome.

jpc647

Clean the IAC?

holmesnmanny

Check the ect sensor for ohms. Should be about 2000-2500 ohms cold and about 180-250 completely warmed up(fans have cycled on).

thirsk66

iTrader: (2)

Okay so I just put my probes from my multimeter on the two iacv wires? I will do this tomorrow morning and see my results if its out of spec do I replace the iacv all together?

holmesnmanny

test the engine coolant temperature sensor not the iacv.

thirsk66

iTrader: (2)

Oh wow okay sorry about that holmesnmanny. Well I will test this out tomorrow morning and let you know the results. Thanks for your help.

thirsk66

iTrader: (2)

It ended up being a bad temperature sensor I just ordered a new one so I hope this fixes my issue.

J.R

How do yu know the tempertature sensor is bad when you can't start the engine?

holmesnmanny

What kind of readings were you getting ?

thirsk66

iTrader: (2)

Well the issue still persists with the new temp sensor installed. So that is ruled out, I am wondering if it has anything to do with my distributor, crank position sensor,or fuel pump not working properly. This issue is making me think to much and just today I drove my car for an hour doing errands and the starting issue was still present on almost every start-up I did. Plus my car was bogging for a few seconds as well then it would return to normal.

The issue is I will go to start the car whether its cold or warmed up and the car does its normal system check with the CEL light coming on for 3 seconds then going off and I can hear the fuel pump priming and main relay clicking. I turn the key over to start the engine and it will just keep cranking until I put my foot on the gas pedal only then will it start-up, and when I go to take my foot off the gas it dies. I really have no idea what this could be. NEED HELP ASAP!

holmesnmanny

The only thing that happens when you push the gas is you get more air. I feel like my first guess is the car is starving for air somehow.

Check your base idle. And how is your regular idle after the car is warmed up ?

holmesnmanny

The iacv is supposed to open up fully on startup. That might not be happening.

thirsk66

iTrader: (2)

Honestly the car idles good when it first starts up it goes up to the normal 1200-1500rpm and then when warmed up its anywhere from 750-800rpm. Do you think this could be a tuning issue or something wrong with the iacv itself. Maybe its something to do with the fact I am using a two wire iacv adapter plate on my euro-r intake manifold.

holmesnmanny

I'm no expert on the two wire iacv conversion setups but it might be best to take it to your tuner and have him check it out with his laptop/ecu.

thirsk66

iTrader: (2)

I agree i need to get my car tuned and see what the issue is on the laptop if the issue can be seen on one. So I shouldnt replace anything right now?

holmesnmanny

I wouldnt. See if the tuner can spot any abormalities.

dark_rican

Same happens to my Euro R in my Lude. Mine is running on a P13 and VAFC last time I drove it. It would turn on no issues and shortly after start to bogg. Most recently while starting the car in my garage time from time for a 20-30 min run, it would start and run fine then bogg down 15 mins later and shut off.

thirsk66

iTrader: (2)

dark rican: I don't know if we have the same issue. My car just struggles to start period, it does not even turn on when I don't have my foot on the gas. And that is when the issue is present when it isn't I have no issue starting my car or re-starting it.

dark_rican

I had that issue in the beginning when i had my IACV problems. I'd have to step on the gas to warm up the car in order to keep it running because it would shut off instantly. That is the purpose of the IACV. It keeps the idle high until the car is warmed up then the idle goes below 1000rpms. Never had the problem in the warm weather.

thirsk66

iTrader: (2)

Well that is my issue now and has been since I have had this swap with my obd1 ecu, I am thinking the iacv table on the chip is what is causing the issue I am having. I have it when the car is cold or warmed up doesn't matter, just a huge pain in the *** when it does happen.

holmesnmanny

Honestly i think it has something to do with the tune. It might be running rich on startup which is why introducing more air helps.

thirsk66

iTrader: (2)

I can honestly believe that the tune is running rich at start-up and I think the entire tune is a mess. I just threw in my P5M-L03 ecu which is the stock ecu that came with my car, and it ran the car a heck of a lot smoother then the chipped obd1 ecu, so I will definitely have to get my car dyno tuned. This is just sad that the map on my obd1 ecu is not that great at all, but I am sure that is why they are called a base map since those are just something to start from before hitting the dyno for a full tune.

snobordboy

Bingo.

Base maps are meant to run the car safely enough to get to a tuner and get tuned properly, so they will generally be rather rich, and very low ignition advance to keep things safe.

thirsk66

iTrader: (2)

Well here is the thing the guy I got my chip from use to be a tunner and he said he was giving me the full tuned map from when he dyno tuned a euro-r. But lesson learned cant trust anyone these days so I am headed to the tuner asap. Do you guys think since I am broke that 3 runs on the dyno will be sufficient enough for a tune? Only reason I ask is its cheaper.

holmesnmanny

Well lets not count your issue fully diagnosed yet. This is just an opinion as to a likely reason for your issue.