hard starting

[88t]

Hi guys, im new here. Ive owned a 90 7mge auto and now i own a 88 7mgte 5speed that i just replaced the head gasket and now runs wonderfull except...

Since i bought it about 3 months ago, it always cranked for about 5-7 seconds then fired up. It runs good other then that. I thought it was just bad compression because i bought it with a bhg, but after that was replaced it still does the same thing.

Timing is dead on, has power, plugs are blackish and i know im running rich for some reason. everything is stock. still on 6-7 lbs of boost.

Im thinking cold start injector? coils bad? Basicly everything is replaced...


any ideas from enjoying the newish ride?

ps, anyone in the detroit area?

thanks in advance,

Patrick




cliffs: supra hard to start after sitting for about 2-5 hrs, car is running alittle rich, has new battery. timing is dead on.

 

[NewWestSupras]

Did you get the injectors cleaned and flowed at all after the head rebuild? You could get a wideband to monitor your a/f's, and do the intake/exhaust. I don't like the stock intake or exhaust for that matter, they seem too restrictive. gl.

 

[omfgitsdonovan]

could it be because you lose pressure in the fuel rail(correct me if im wrong)after the vehicle sits for to ling? such as over night?

 

[grimreaper]

first start of the day is like this for me too. After its been running i have to let it sit for a few hours to recreate the longer crank time. otherwise starts right up.

Do you have a charcoal canister still?

 

[arod]

Mine has the same simptoms. Also, I don't have the charcoal canister.

 

[87M-GTE]

What would the canister have to do with anything? I thought that was for emissions..

 

[hvyman]

it is for emissions and has nothing to do with the starting system. its better to have it tho.(hide if you think its ugly) actually it is better that it takes that long to start that way you have more oil in the engine before it starts. if it troubles you that much check the things out on this link.
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=12

 

[fonz87]

I got the same stupid ass problem! Not sure what the problem is.

 

[Gunnar]

Same here, and i'm suspecting pressure loss while sitting overnight.

 

[CzA]

I also have the same thing. Could it be fuel filter?

 

[hvyman]

fuel filter is supposed to be a lifetime filter. check the things in the link above. if everything checks out its normal.

 

[frtrea]

Hi,

Had the same problem over last summer and finally fixed it last week, I'm up in Montreal Canada. My Cold Start Injector was not doing the job. I would the following:

Before doing your first start in the morning:
1) Disconnect your CSI fuel supply banjo bolt and put the fuel line in a bottle. Put your key at start position, but do not start. Then under the hood, with a paper clip, in the diagnostic box, jump +B and Fp, this will activate your fuel pump. If you get fuel in the bottle instantly (less than 1 sec), your fuel pump/filter is probably not the problem.

2) Remove CSI, and disconnect electrical connector. Reconnect the fuel line to the CSI, and reactivate the fuel pump same as above. Then use two wire to provide 12Volt from the battery directly to the CSI connector, it should spray. If it doesn't remove and clean the CSI or replace it...

3) You can also check if you CSI switch near the thermostat works fine, refer to MKIII Shop Manual.

Hope this helps.

 

[tekdeus]

I'm not sure, but I've read that the Cold Start Injector doesn't work until it is below 50-60 degrees. Many people have eliminated the CSI, and do not have problems starting in the morning, in average climates.

My car is hard to start cold, and I'm getting code 43, which means the ECU is not getting the signal that I'm trying to start the engine. There is a break in that circuit somewhere, and I'm going to try wiring a signal wire direct to the ECU.

JetJock says that this signal makes all 6 injectors fire at once upon startup, so I'm thinking it may be my problem.

 

[grimreaper]

they make a new csi time swtich that allows it to operate the csi till the low 100 degree water temps. Still hasnt fixed the problem for me though (got it with car)

 

[fonz87]

im also mis firing

 

[Gunnar]

Fpr was broken. I replaced it since i had a spare one lying around and starting problems gone.

 

[grimreaper]

^^ how did you test it and what where your results? Most guys dont have extras laying around

im also mis firing

have you looker at your vf's? when i max them out lean, i get suttle (sp?) mis fires at idle

 

[Gunnar]

Was talking to a friend of mine who tunes volvos and owns a volvo dealership, he said it sounded a lot like a problem a certain model of volvo has pretty often.
I bought a complete fuelrail with the fpr on it on ebay about a year ago and decided to just swap the fpr, fixed the problem.

 

[Grimsta]

I was going to say FPR, but you guys beat me to it. It IS relative to the car loosing pressure from sitting for so long. It then has to build pressure again. Thing is, a pressurized fuel system SHOULDN'T lose its pressure. If the pressure, therefore, is lost from sitting for a long time, your regulator is the problem because the regulator is what lets the fuel trickle back to the tank, and if there is no manifold vacuum it should be keeping the system pressurized

 

[grimreaper]

and what does the relief valve on the fuel pump do? or an injector leak?