Hard starting when hot...
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Senior User
Joined: Mar 2001
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From: gulf coast
Hard starting when hot...
My 1991 EB with a 302 starts right up in the morning when it is cool but after the engine temp gets up to normal, I have to engage the starter for about 10 to 15 seconds before she kicks off. Anybody got suggestions on what to check? Thanks!
Posting Guru
Joined: Jul 2001
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Hard starting when hot...
Has anybody cleaned the throttlebody while it was still on the truck? The cleaning agent will destroy the gasket between the upper and lower intakes and allows too much air in. You may also have injectors going bad. If it is the injectors and you plan on keeping the truck, replace with Ford NEW injectors. They are worth the extra $$$.
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Joined: Jun 2000
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Hard starting when hot...
Symptoms not quite like yours but truck ran fine when cool and felt like running out of gas when warm, ping and stall. It was the fuel pump. Best source for Ford injectors is PPI. They're $99 a set for new take offs(19 lbs). Don't think injectors are your problem though. Rough idle and part throttle pinging have been my experience with bad injectors. They usually go out a few at a time, which will allow the motor to run/start even if like ******.
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Senior User
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From: gulf coast
Hard starting when hot...
Thanks for the replys guys but the engine runs fine after it starts. I do get a very quick "pinging" sound just before it starts (when engine is at normal operating temp).The noise only occurs at that time is very short in duration.
Laughing Gas
Joined: Jul 2001
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From: Bismarck, ND
Hard starting when hot...
Just cured the exact same problem in my '85 302 EFI. It was the main (frame mounted) fuel pump, although we also checked the regulator. The pump still ran, but just wasn't making the pressure. I really didn't seem to notice any changes in driveability or running once the truck started, but with the guages on it the pressure was way low. It would start fine when cool (having sat overnight), but once it was warm, the pump must have had a problem overcoming fuel line vapor, or something. Needed to crank it ten seconds or so. Try this..... when your truck is warm, and you're expecting it to be hard to start, turn on the ignition key (don't crank the engine). Wait a couple of seconds and turn it off. Then, turn it on again and repeat the cycle several times. Then, go ahead and crank the engine and observe how it starts. If it fires right up, as normal, you have a fuel pressure problem (cycling the key on and off, in turn, cycled your pump, and allowed it to build good pressure in the line). Good luck!
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Joined: Mar 2001
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From: gulf coast
Hard starting when hot...
Tried the off/on thing with the ignition today and you're right. It started up just fine. Must be the pump you mentioned. I thought the only pump was in the fuel tank. Where is this little jewel located? Thanks again!
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Laughing Gas
Joined: Jul 2001
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From: Bismarck, ND
Hard starting when hot...
Mine is located inside the driver's side frame rail, just about directly underneath the firewall area (you can see it from underneath the hood, below the power brake booster). The way it was explained to me, the in-tank pump serves as a booster, to give the fuel the initial shove out of the tank and upline, where the main (frame-mounted) pump takes over, giving it the high-pressure shot to the regulator and engine.
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Hard starting when hot...
[font size="1" color="#FF0000"]LAST EDITED ON 11-Aug-01 AT 10:49 PM (EST)[/font][p]Somewhere along the years, they changed the design. The two pumps in series idea wasn't used anymore, they went to just the tank mounted pump, a high pressure one. '94 has the tank mounted single pump only. Don't know what year was the changeover.
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From: gulf coast
Hard starting when hot...
Thanks guys. I'll look for that 2nd pump if/when it ever stops raining down here (Lower Al.) May have to use the truck to evacuate if it don't stop soon!
Mountain Pass
Joined: Apr 2000
Posts: 102
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From: Arkansas
Hard starting when hot...
Could some of the symptoms described, such as the fuel pump, cause my 88 Bronco with a 5.0 be hard to start when cold? It is
always much easier to start when hot. If I keep the starter engaged until it does start when cold it will take about 5 to 10 seconds to crank up. My 89 F150 with the 4.9 always starts in less than 1 or 2 seconds.
always much easier to start when hot. If I keep the starter engaged until it does start when cold it will take about 5 to 10 seconds to crank up. My 89 F150 with the 4.9 always starts in less than 1 or 2 seconds.
Laughing Gas
Joined: Jul 2001
Posts: 1,019
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From: Bismarck, ND
Hard starting when hot...
I can't tell you, for sure. It almost seems that a cold hard-starting problem (if it's fuel-related) could be from fuel having a hard time being pumped up out of the tank and to your high-pressure pump. Where my high-pressure pump wore out and was having a tough time building pressure with warm, less dense fuel, I guess it's possible that your in-tank pump could be excessively worn internally, and straining to move fuel out of the tank and up the cold, dark empty line in the morning to get it to where the high pressure one can pick up and take over. Once the truck is warm and has fuel in the line, it may be easier for the high-pressure pump to suck in what's there and fire your truck, at least until you shut it down for a while and the fuel drains back down into the tank. My logic may be flawed here, but it seems possible. Have you made sure you've got a clean fuel filter? As this is between your pumps, it's possible that this could be restricting the in-tank pump's abilities, though it would seem that this would affect your truck both warm and cold.....
