JimmyM86

Specs: Completely stock 89 HB (D15B2) DPFI


I'm trying to figure out what would cause my car to dump too much fuel on startup and not allow the car to start...When it decides to get started it runs at 100%, but on the startup crank it appears to be getting way too much gas, and doesn't allow the engine to start properly. It seems to attempt to start better the colder it is outside...We've looked down the intake (with the cover removed) and we can see the top injector dumping TONS of gas and smell ALOT of gas coming out the exhaust. When I pull the plugs they are all wet (gas)...

FYI: I'm getting good spark, compression is good, timing is dead on, etc...

I was only throwing 1 engine code and it was for the coolant temp sensor. I replaced it and it is still doing the same thing, but not throwing any more engine codes. I'm pretty much stumped on what it could be causing too much fuel on startup, but allowing it to run perfect once it is started, and not have the ecu throw any codes.

Any ideas from you smart guys???

Thanks

A BOOSTED CRX

ehhh dunno, but MAYBE fuel filter, pump, sorry, just giving you ideas


good luck

grog

lack of spark maybe. when my ignigter went bad it stunk like gas, but it ran like ****. i was still getting spark but it was too weak or somthing.

JimmyM86

Thanks...But spark is fine (blue)...The only issue (I believe) is fuel amount at startup. If/When it starts, it will run PERFECT.

JimmyM86

Anyone else have any ideas???

Chiovnidca

Stock engine and ecu? Have you checked the ect and map sensors?

~sp33~

Main relay? would effect start up and seems to let the car run fine once started. It also is less likely to stuff up in cooler weather.

Chiovnidca

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ~sp33~ &raquo;</TD></TR><TR><TD CLASS="quote">Main relay? would effect start up and seems to let the car run fine once started. It also is less likely to stuff up in cooler weather.</TD></TR></TABLE>
Usually when a main relay acts up it cuts the fuel.

jlicrx

fuel pressure regulator

92BLKINTEGRA

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">fuel pressure regulator</TD></TR></TABLE>

I'm with him on this one, It could be Fuel Pressure Regulator.

alscrx

Def check your injectors, fuel pressure reg, and see if your tps when out of adjustment.

Fuzzy Rhubarb

Did you tune your ECU? Your startup enrichment might be a little out of whack.

Chiovnidca

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">fuel pressure regulator</TD></TR></TABLE>
That's a good possibility. Pull the vacuum line off and check for fuel in it.

88hbz6

The injectors might be sticking and not cutting off the fuel, try repacing them. The wires on DPFI connectors are the same color to the fuel inj. they plug in to. Make sure they arent connected wrong.

JimmyM86

Is there a way to test the Fuel Pressure Regulator??? I don't want to thrown down $70+ on a new one and find out it wasn't the problem

***It's hard to check for fuel pressure b/c it doesn't start.

I removed the vaccum line for the FPR and there was no gas in it.

(Stock DX, Stock D15B2, Stock ECU, Stock EVERYTHING...)

Thanks a ton guys!

Chiovnidca

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimmyM86 &raquo;</TD></TR><TR><TD CLASS="quote">Is there a way to test the Fuel Pressure Regulator??? I don't want to thrown down $70+ on a new one and find out it wasn't the problem

***It's hard to check for fuel pressure b/c it doesn't start.
</TD></TR></TABLE>
It should get fuel pressure when you turn the key on. Can you hear the pump cycle?

AK_CRX

key word here is DPFI, I've had this issue so many times with honda's but only with the DPFI... They flood themselves all the time especially if its got a butt load of miles racked up on it. They work perfect when they are low mileage cars. Anyways my theory is worn out injectors that leak when the car is turned off, fuel is pressurized in the system and I think the pressure on the old injectors just makes them drip drip drip when the car is sitting. Especially if you just started the car up for the first trip of the day, drive 10-15 minutes shutting it off then trying to start it back up after letting it sit for less than an hour. They just sit and crank crank crank sometimes backfiring through the intake manifold sounding like a fart. In the past I've just switched the throttle body and injectors from a lesser mileage engine on there and the problem goes away. I've also found that letting the engine idle for a period of time before shutting it off will make start up a bitch... A sign of the injector not regulating fuel well enough at low engine speed and letting fuel build up in the chambers hence a flooded engine as soon as you shut it off and try to re-start. My trick to getting them to start up against their will is to unscrew the DPFI cover, stick a screwdriver in the top butterfly to let more air in, pull the injector plug so the engine won't get more fuel as you crank, crank it a few times giving the fuel in the engine a chance to burn off a bit, then plug the injector back in and start it up. Remove screwdriver from upper butterfly, replace DPFI cap with only two screws so its faster to remove next time and your on your way. Sounds ghetto but hey if your still running DPFI your already ghetto, haha just kidding.... But seriously. Upgrade to mult-point, it shouldn't cost more than $150 worth of parts at a pick&pull and takes about 6 hours your first time. Problem solved

davesrex

Your ECT sensor controls the pulse width modulation of the fuel injectors on start up untill its warm enough and then your o2 sensor takes over the pwm of the injectors.

hondadude_rudo

ok, realy dumb question, but what is an ect sensor?

JimmyM86

It tells the ECU what temp the coolant is and adjusts fuel mixture accordingly...

JimmyM86

Alright...I replaced the Fuel Pressure Regulator and pulled some injectors off a car at the junk yard that only had 123K miles. I put them on my car and it still won't start (the first crank it will act like its going to start, but nothing after that). I pulled the spark plugs and they are still pretty wet.

Any other ideas??? My free car is starting to be a pain in the butt!

Thanks-

JimmyM86

What about the IAT (Intake Air Temp) Sensor?

I figured if it was something electrical I would be throwing an engine code, but I'm not, so I'm not sure this could be it...

Any ideas??? I'm stumped...

hondadude_rudo

not trying to jack the thread, just learn. is the ect sensor the one next to the temp sending unit cus i cant find it ne where in my gay hanes manual.

hondadude_rudo

and to the op, if you cant figur it out, then just convert to mpfi. i got almost everything you need if you want to im me. i can even direct you to where you can get the info.

JimmyM86

It is below your distributor and screws into the block...

I know switching over to MPFI is better, but at the present I would prefer to get this DPFI running and take advantage of the gas mileage. I'll have access to a decent D16z6 motor in the near future and it will be going in the car when this motor craps out, but it has plenty of life left in it so it won't be anytime soon...

I got this car for free (and it's all origonal) and I want to drive the motor into the ground before I go and replace it with something better...