Unreliable starting. (Problems starting)

Hiccups · 05-15-2009, 03:22 PM

((Sorry, I made the same post a few days ago and got a few answers, but I decided to make a fresh-more clear one. I was told to check the igniter coils, where exactly are they? And what do i look for?))

When I start it in the morning (or when it hasn't been run for the day), it will never start the first time. I can't remember if it ever has. BUT it will almost ALWAYS start the second try. Lately though, it seems to be having a harder time. It still starts the second turn over, but it almost sounds like its on the verge of dying (so i give ti some gas), but doesn't quite die. ITS definitely getting worse, and near dying.

Also, it will usually start if you turn it off and back on again quickly after its been running (but that could be expected).

I'm guessing this is gradual and eventually it wont start (then i might be able to diagnose the problem). But I cant really keep driving it till it dies...

BOTTOM LINE. It almost never starts after its been driven for 20 minutes, then stopped. If I wait a while, it usually starts (like 20 or more minutes tho). This leaves me stranded sometimes.

Has anyone else experienced this? Or do you think you know what it is?

(Its an 87 turbo btw)

MZDA5274 · 05-16-2009, 01:27 PM

fuel pump maybe... Not too sure though.

dunewarz · 05-16-2009, 09:07 PM

Most likely a fuel system problem. Sounds like it could be the fuel pump though. Turn the key to the on position and wait for 5 seconds then turn it off do it again a second time but this time turn the engine over.

Do this first before starting your car for the first time. Try to pump a full tank of gas into it as well. If you can start it easier with a full tank then it's the fuel system.

What this does is send fuel to the fuel rail. When the engine is turned to the on position the fuel pump pushes fuel into the fuel rail. If you have a weak fuel pump or clogged fuel system the fuel has difficulty getting to the injectors causing you to have to crank the engine muiltiple times before it starts.

dunewarz · 05-16-2009, 09:10 PM

I think it might be a faulty ignitor too. Or maybe it could be flooding with fuel or maybe coolent.

Curtis · 05-16-2009, 10:17 PM

You could check your starter, fuel pump, fuel lines, fuel filter, ect...

My friend has a 7m-ge and it will never start the first turn, always second or third, i know of three supra's that do this.

It wouldn't be your ecu? Would it? Maybe it's confused and not pumping the right amount of gas/air mixture ratio...

Check those things out.

MZDA5274 · 05-16-2009, 10:24 PM

well if it was floodage wouldn't there be black smoke on start?

btwilson86 · 05-16-2009, 11:26 PM

Fuel pump on these cars doesn't turn on until the engine starts to crank (which is why it is common for them to have to crank a little bit longer than many other vehicles). How long do you crank it the first time? How lond do you wait between tries?

Hiccups · 05-17-2009, 07:36 PM

Well Idk about the fuel pump. I was literally at a gas station, just filled up, and it wouldn't start. I can catch it in gear, and thats what I did. But I cant do that all the time so this needs fixed.

Ill still try "Turn the key to the on position and wait for 5 seconds then turn it off do it again a second time but this time turn the engine over. " that. But idk.

If it wouldnt start on a full tank idk...

rr0621 · 06-01-2012, 02:50 PM

<- im going crazy

Quote:

Originally Posted by Hiccups

((Sorry, I made the same post a few days ago and got a few answers, but I decided to make a fresh-more clear one. I was told to check the igniter coils, where exactly are they? And what do i look for?))

When I start it in the morning (or when it hasn't been run for the day), it will never start the first time. I can't remember if it ever has. BUT it will almost ALWAYS start the second try. Lately though, it seems to be having a harder time. It still starts the second turn over, but it almost sounds like its on the verge of dying (so i give ti some gas), but doesn't quite die. ITS definitely getting worse, and near dying.

Also, it will usually start if you turn it off and back on again quickly after its been running (but that could be expected).

I'm guessing this is gradual and eventually it wont start (then i might be able to diagnose the problem). But I cant really keep driving it till it dies...

BOTTOM LINE. It almost never starts after its been driven for 20 minutes, then stopped. If I wait a while, it usually starts (like 20 or more minutes tho). This leaves me stranded sometimes.

Has anyone else experienced this? Or do you think you know what it is?

(Its an 87 turbo btw)

I am having the same issue, My car sounds GREAT when running but once it stalls (sometimes during driving) it wont start again. Cranks and will EVENTUALLY turn over but only if i hold the gas peddle down, wont go above 100 rpms, as soon as i let go of gas peddle it will die.

my car is in no reliable condition right now and i need it to get to work. someone please help me, i have replaced spark plugs, full tank of gas,

Issue first started after putting too much oil in the car, went through the process of cleaning it out and my MECHANIC said it should be running great just needs to be driven, but it seams to get worse and worse, and now HE HAS NO CLUE and gives up.....

cre · 06-01-2012, 05:33 PM

The fuel rail is SUPPOSED to retain pressure. If it bleeds off too quickly you'll have issues with warm starts: low pressure and possibly fuel vapor locking up the rail. Culprits: FPR and FPD.

If you have a 7M-GE the FC switch inside the AFM may be failing as well. If this is the case the fuel pump may lose power when the throttle plate is close to closed and not completely closed.

Protip: The FC circuit on the 7M can be wired to a momentary switch *TEMPORARILY* as a fuel primer switch. Just put the key to the ON position and press the button for a count of 5 or so to bring the system's pressure up.

@rr0621: Have you checked for diagnostic codes? Cleaned the ISCV? Is the TPS working and properly calibrated? If you don't know how to check these please try searching the forum for these specific items I think they're more likely to be the source of your problem.

05-15-2009, 03:22 PM	#1
Hiccups Stock Join Date: Mar 2009 Location: PA Posts: 26	Unreliable starting. (Problems starting) ((Sorry, I made the same post a few days ago and got a few answers, but I decided to make a fresh-more clear one. I was told to check the igniter coils, where exactly are they? And what do i look for?)) When I start it in the morning (or when it hasn't been run for the day), it will never start the first time. I can't remember if it ever has. BUT it will almost ALWAYS start the second try. Lately though, it seems to be having a harder time. It still starts the second turn over, but it almost sounds like its on the verge of dying (so i give ti some gas), but doesn't quite die. ITS definitely getting worse, and near dying. Also, it will usually start if you turn it off and back on again quickly after its been running (but that could be expected). I'm guessing this is gradual and eventually it wont start (then i might be able to diagnose the problem). But I cant really keep driving it till it dies... BOTTOM LINE. It almost never starts after its been driven for 20 minutes, then stopped. If I wait a while, it usually starts (like 20 or more minutes tho). This leaves me stranded sometimes. Has anyone else experienced this? Or do you think you know what it is? (Its an 87 turbo btw) Last edited by Hiccups; 05-15-2009 at 10:28 PM. Reason: Emphasize its getting worse...

05-16-2009, 10:17 PM	#5
Curtis Stock Join Date: Apr 2009 Location: Prince Albert, Saskatchewan Posts: 22	You could check your starter, fuel pump, fuel lines, fuel filter, ect... My friend has a 7m-ge and it will never start the first turn, always second or third, i know of three supra's that do this. It wouldn't be your ecu? Would it? Maybe it's confused and not pumping the right amount of gas/air mixture ratio... Check those things out. __________________ they.call.me.curtis

05-16-2009, 11:26 PM	#7
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Fuel pump on these cars doesn't turn on until the engine starts to crank (which is why it is common for them to have to crank a little bit longer than many other vehicles). How long do you crank it the first time? How lond do you wait between tries? __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

06-01-2012, 05:33 PM	#10
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The fuel rail is SUPPOSED to retain pressure. If it bleeds off too quickly you'll have issues with warm starts: low pressure and possibly fuel vapor locking up the rail. Culprits: FPR and FPD. If you have a 7M-GE the FC switch inside the AFM may be failing as well. If this is the case the fuel pump may lose power when the throttle plate is close to closed and not completely closed. Protip: The FC circuit on the 7M can be wired to a momentary switch TEMPORARILY as a fuel primer switch. Just put the key to the ON position and press the button for a count of 5 or so to bring the system's pressure up. @rr0621: Have you checked for diagnostic codes? Cleaned the ISCV? Is the TPS working and properly calibrated? If you don't know how to check these please try searching the forum for these specific items I think they're more likely to be the source of your problem. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Starting Problems	turbo jim	MKIII Supra	7	03-30-2009 07:09 PM
cold starting problems	Cjanik	MKIII Supra	9	08-02-2008 06:50 PM
starting problems	Donovan	MKIII Supra	2	06-09-2007 05:53 PM
Starting problems and accleration problems!	alekjame22	MKIII Supra	6	03-17-2007 11:19 PM
Starting problems HELP	adellicson	MKIII Supra	0	05-08-2006 03:42 AM

05-16-2009, 01:27 PM	#2
MZDA5274 Stock Join Date: May 2009 Location: MA Posts: 16	fuel pump maybe... Not too sure though.

05-16-2009, 09:07 PM	#3
dunewarz 3" Exhaust Join Date: May 2009 Location: WhiteBear Posts: 54	Most likely a fuel system problem. Sounds like it could be the fuel pump though. Turn the key to the on position and wait for 5 seconds then turn it off do it again a second time but this time turn the engine over. Do this first before starting your car for the first time. Try to pump a full tank of gas into it as well. If you can start it easier with a full tank then it's the fuel system. What this does is send fuel to the fuel rail. When the engine is turned to the on position the fuel pump pushes fuel into the fuel rail. If you have a weak fuel pump or clogged fuel system the fuel has difficulty getting to the injectors causing you to have to crank the engine muiltiple times before it starts.

05-16-2009, 09:10 PM	#4
dunewarz 3" Exhaust Join Date: May 2009 Location: WhiteBear Posts: 54	I think it might be a faulty ignitor too. Or maybe it could be flooding with fuel or maybe coolent.

05-16-2009, 10:24 PM	#6
MZDA5274 Stock Join Date: May 2009 Location: MA Posts: 16	well if it was floodage wouldn't there be black smoke on start?

05-17-2009, 07:36 PM	#8
Hiccups Stock Join Date: Mar 2009 Location: PA Posts: 26	Well Idk about the fuel pump. I was literally at a gas station, just filled up, and it wouldn't start. I can catch it in gear, and thats what I did. But I cant do that all the time so this needs fixed. Ill still try "Turn the key to the on position and wait for 5 seconds then turn it off do it again a second time but this time turn the engine over. " that. But idk. If it wouldnt start on a full tank idk...