Cranks but doesn't start
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Cranks but doesn't start
I got a 1984 f-250 6.9L IDI... It had been sitting since 07 until I got the rear axel on it and me and my dad drove it to his house... It doesn't want to start now all it does is crank but not start... It was driven to where it was parked in 07 and my great grandparents used it as a daily driver until then... Any ideas on what the problem is and how I could fix it... It tries to start better now that I changed the o-rings on the two leaking injectors
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These diesels need a few things to start. Fuel, air, compression.
I don't know where you're at, but if you're in a cold climate with this problem, my first inclination would be the glow plugs and/or the relay. I assume you've already verified your batteries and starter are good. If it's cranking slowly, then the batteries and/or starter may be to blame.
Next, check for fuel. Verify there's fuel in the filter. If there is, move on down the line. Crack the injectors and ensure that there's actually fuel being delivered to the combustion chamber.
If the truck sat for a long time, it's possible that something corroded enough that it was able to develop a leak once you started it up, that is no longer permitting it to start.
Just my thoughts. I'm still learning about these IDI's myself, so I'm certain there are simple things that I haven't mentioned.
I don't know where you're at, but if you're in a cold climate with this problem, my first inclination would be the glow plugs and/or the relay. I assume you've already verified your batteries and starter are good. If it's cranking slowly, then the batteries and/or starter may be to blame.
Next, check for fuel. Verify there's fuel in the filter. If there is, move on down the line. Crack the injectors and ensure that there's actually fuel being delivered to the combustion chamber.
If the truck sat for a long time, it's possible that something corroded enough that it was able to develop a leak once you started it up, that is no longer permitting it to start.
Just my thoughts. I'm still learning about these IDI's myself, so I'm certain there are simple things that I haven't mentioned.
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Senior User
Joined: Oct 2015
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These diesels need a few things to start. Fuel, air, compression.
I don't know where you're at, but if you're in a cold climate with this problem, my first inclination would be the glow plugs and/or the relay. I assume you've already verified your batteries and starter are good. If it's cranking slowly, then the batteries and/or starter may be to blame.
Next, check for fuel. Verify there's fuel in the filter. If there is, move on down the line. Crack the injectors and ensure that there's actually fuel being delivered to the combustion chamber.
If the truck sat for a long time, it's possible that something corroded enough that it was able to develop a leak once you started it up, that is no longer permitting it to start.
Just my thoughts. I'm still learning about these IDI's myself, so I'm certain there are simple things that I haven't mentioned.
I don't know where you're at, but if you're in a cold climate with this problem, my first inclination would be the glow plugs and/or the relay. I assume you've already verified your batteries and starter are good. If it's cranking slowly, then the batteries and/or starter may be to blame.
Next, check for fuel. Verify there's fuel in the filter. If there is, move on down the line. Crack the injectors and ensure that there's actually fuel being delivered to the combustion chamber.
If the truck sat for a long time, it's possible that something corroded enough that it was able to develop a leak once you started it up, that is no longer permitting it to start.
Just my thoughts. I'm still learning about these IDI's myself, so I'm certain there are simple things that I haven't mentioned.
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Joined: May 2015
Posts: 785
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Well if you know that it's cranking as it should and you're getting fuel through all of the injectors, that only leaves a lack of air or lack of compression. Is your air cleaner or intake blocked somehow?
On the compression side, your rings could be shot, head gaskets could be shot, worst case scenario would be a cracked head or block, though I doubt it.
Are you trying to start it in the cold? Have you verified that the glow plugs are in good working order?
On the compression side, your rings could be shot, head gaskets could be shot, worst case scenario would be a cracked head or block, though I doubt it.
Are you trying to start it in the cold? Have you verified that the glow plugs are in good working order?
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Senior User
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Well if you know that it's cranking as it should and you're getting fuel through all of the injectors, that only leaves a lack of air or lack of compression. Is your air cleaner or intake blocked somehow?
On the compression side, your rings could be shot, head gaskets could be shot, worst case scenario would be a cracked head or block, though I doubt it.
Are you trying to start it in the cold? Have you verified that the glow plugs are in good working order?
On the compression side, your rings could be shot, head gaskets could be shot, worst case scenario would be a cracked head or block, though I doubt it.
Are you trying to start it in the cold? Have you verified that the glow plugs are in good working order?
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Laughing Gas
Joined: Dec 2003
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From: Ford, WA
if it has a manual trans, hook a tow strap up to it, put it in 2nd or 3rd gear, pull it with another truck, and pop the clutch.. that is how I got mine to run..the starter just wasn't turning it over fast enough..that and the low compression wasn't helping it either..
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Elder User
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Black smoke isn't a bad glow plug. Bad glow plugs will cause unburnt fuel to be sent through the exhaust, which is white smoke with a bitter smell.
A bad fuel filter is easy to check, pop it off and look at it. There's no such thing as a "cold air" fuel filter. Do you mean replace your exhaust air filter?
A bad fuel filter is easy to check, pop it off and look at it. There's no such thing as a "cold air" fuel filter. Do you mean replace your exhaust air filter?
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square #1
Ok. Go back to the previous advice on glow plugs and air intrusion, cranking speed, that and the stickies at the top of the forum will help you out. It's just a matter of being thorough with everything.
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There might be some air in the lines still... I will hopefully have the tools to check the glow plugs soon... I have 2 weeks to get it running good then I have less time because of school
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A weak starter will cause a no-start situation even with everything else running perfectly. You shouldn't have introduced any air to the system by replacing the filter, and even if there was air, it would work its way out as you turn the engine over. You have to remember not to run the starter continuously though, because that will fry it.
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