Problems at Start-Up
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Junior User
Joined: Feb 2005
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Problems at Start-Up
I have an '88 Bronco with a fuel injected 302. A few months back when I went to start up my bronco which I never had a problem with before, it died after about 5 seconds. When I turn it over the rpm gauge hits about 1,700 and holds for around 10 seconds and than just drops and it dies. The only way to keep it running at start up is to hold in the gas pedal which seems weird to be seeing as its EFI. I have since relapced the alternator, starter, battery terminals, as well as having the battery checked. Just yesterday I did an engine flush and replaced the fuel filter. But this morning at start-up it died on me again. I am running out of ideas but i've heard a few mentions before like replace the pcv valve, or it could be a sensor, only I know nothing about sensors or where to even find them. Can someone please give me some information that I can put to use and hopefully fix this problem. It is quite aggravating, I love the EFI for the fact that you can just turn the key and walk away while it warms up, or use the remote keyless entry to start it up. Which is something I would like to add to this, but first I need to solve the problem as to why it dies like that. Could it have anything to do with my exhaust manifold being cracked and perhaps not getting enough pressure? I've even removed the gas cap on start up thinking it was vapor lock, but nothing seems to help. Any suggestions would be greatly appreciated.
Posting Guru
Joined: Jun 2004
Posts: 1,371
Likes: 0
From: just outside of Phila.
Wow...ok, first...that font you typed in is pretty hard to read. I'm 24 and have some good eyes, and I was squinting and reading it like I was 80, but I digress.
There's a lot of people--if not all--who have run into problems like this and have a fix for it. In fact, I thought there was a whole post for these types of problems and fixes? Try a search, especially for what I mention at the bottom, and see how many posts there are. There is a Big Bronco FAQ up on top of this forum too...you should check that out as well.
When my 88 did it, I went through everything. I did the fuel filter, the cap, etc. I think the combo that eventually did away with everything was a new O2 sensor, a new TPS, a new IAC, EGR and a new ICM. LETTERS! SO MANY LETTERS!
Grab a Haynes manual and go through it...it does an OK job for the Broncos and simple repairs.
TPS=Throttle Position Sensor
IAC=Idle Air Control
O2 = Oxygen Sensor
ICM=Ignition Control Module
I wish I could help more, but at that point, I was stabbing in the dark. Do a search for those 4 items, and you'll find a lot of info.
There's a lot of people--if not all--who have run into problems like this and have a fix for it. In fact, I thought there was a whole post for these types of problems and fixes? Try a search, especially for what I mention at the bottom, and see how many posts there are. There is a Big Bronco FAQ up on top of this forum too...you should check that out as well.
When my 88 did it, I went through everything. I did the fuel filter, the cap, etc. I think the combo that eventually did away with everything was a new O2 sensor, a new TPS, a new IAC, EGR and a new ICM. LETTERS! SO MANY LETTERS!
Grab a Haynes manual and go through it...it does an OK job for the Broncos and simple repairs.
TPS=Throttle Position Sensor
IAC=Idle Air Control
O2 = Oxygen Sensor
ICM=Ignition Control Module
I wish I could help more, but at that point, I was stabbing in the dark. Do a search for those 4 items, and you'll find a lot of info.
Thread Starter
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Junior User
Joined: Feb 2005
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Ok, well I couldn't find a way to edit my post so here it is, with much clearer font:
I have an '88 Bronco with a fuel injected 302. A few months back when I went to start up my bronco which I never had a problem with before, it died after about 5 seconds. When I turn it over the rpm gauge hits about 1,700 and holds for around 10 seconds and than just drops and it dies. The only way to keep it running at start up is to hold in the gas pedal which seems weird to be seeing as its EFI. I have since relapced the alternator, starter, battery terminals, as well as having the battery checked. Just yesterday I did an engine flush and replaced the fuel filter. But this morning at start-up it died on me again. I am running out of ideas but i've heard a few mentions before like replace the pcv valve, or it could be a sensor, only I know nothing about sensors or where to even find them. Can someone please give me some information that I can put to use and hopefully fix this problem. It is quite aggravating, I love the EFI for the fact that you can just turn the key and walk away while it warms up, or use the remote keyless entry to start it up. Which is something I would like to add to this, but first I need to solve the problem as to why it dies like that. Could it have anything to do with my exhaust manifold being cracked and perhaps not getting enough pressure? I've even removed the gas cap on start up thinking it was vapor lock, but nothing seems to help. Any suggestions would be greatly appreciated.
I have an '88 Bronco with a fuel injected 302. A few months back when I went to start up my bronco which I never had a problem with before, it died after about 5 seconds. When I turn it over the rpm gauge hits about 1,700 and holds for around 10 seconds and than just drops and it dies. The only way to keep it running at start up is to hold in the gas pedal which seems weird to be seeing as its EFI. I have since relapced the alternator, starter, battery terminals, as well as having the battery checked. Just yesterday I did an engine flush and replaced the fuel filter. But this morning at start-up it died on me again. I am running out of ideas but i've heard a few mentions before like replace the pcv valve, or it could be a sensor, only I know nothing about sensors or where to even find them. Can someone please give me some information that I can put to use and hopefully fix this problem. It is quite aggravating, I love the EFI for the fact that you can just turn the key and walk away while it warms up, or use the remote keyless entry to start it up. Which is something I would like to add to this, but first I need to solve the problem as to why it dies like that. Could it have anything to do with my exhaust manifold being cracked and perhaps not getting enough pressure? I've even removed the gas cap on start up thinking it was vapor lock, but nothing seems to help. Any suggestions would be greatly appreciated.
Freshman User
Joined: Aug 2004
Posts: 30
Likes: 0
My guess is the IAC is sticking. I was told a long time ago when I had this same problem to get someone to start it up and hold the gas while I hit the IAC with a wrench and it would unstick. Sure enough that worked then I knew that was the problem. Best part is I had the truck another 2 years and it never stuck again so I never even replaced the thing.
Cargo Master
Joined: Nov 2003
Posts: 2,000
Likes: 39
From: North Dakota
Pull the codes! Even if your check engine light is not on.
This will show you how to do it without the code reader.
http://fordfuelinjection.com/?p=13
This will show you how to do it without the code reader.
http://fordfuelinjection.com/?p=13
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