Hard or no warm start
#1
![Default](/forum/images/icons/icon1.gif)
My 86 5.3 always starts perfectly when cold or after sitting overnight. Recently, and occasionally, it will not start after a short trip. Sometimes there is just a click and other times the engine turns over for about 10 seconds before, reluctantly, starting. The battery is new and the volt meter is dead on. I can understand a hard warm start problem, but just the click is where I have having difficulty. All connections are perfectly tight. I was thinking starter or starter solenoid, but that would occur all the time, not just when warm -- correct?
Thoughts?
Thanks!
Thoughts?
Thanks!
#2
![Default](/forum/images/icons/icon1.gif)
there are a lot of stories circulating about difficult warm starts. and i have also experienced a similar symptom, especially when the engine is running on the warm side.
the prevailing explanation is fuel vaporization in the fuel rail--did i get that right?--from the heat of the engine after shutdown.
following others' suggestions i've been able to get over this by turning the key to the on position for several seconds to allow the fuel pump to run, then switching back to off, and repeating 2-3 times, prior to actually turning to the start position.
if i don't do this, the start will be rough, and will only stay on if i hold the accelerator down and continue to keep the throttle open for a a minute or 2. then it tends to normalize.
the prevailing explanation is fuel vaporization in the fuel rail--did i get that right?--from the heat of the engine after shutdown.
following others' suggestions i've been able to get over this by turning the key to the on position for several seconds to allow the fuel pump to run, then switching back to off, and repeating 2-3 times, prior to actually turning to the start position.
if i don't do this, the start will be rough, and will only stay on if i hold the accelerator down and continue to keep the throttle open for a a minute or 2. then it tends to normalize.
The following users liked this post:
Jagxjs (04-05-2013)
#3
![Default](/forum/images/icons/icon1.gif)
@ Jagxjs
Sounds like you have 2 problems..... your "clicking" would appear to be a separate issue from the "cranking and cranking before spluttering into life"
The latter is as per DrScientists suspicions, ie fuel vapour lock most probably
The former sounds like something to do with the starter for sure.....
Sounds like you have 2 problems..... your "clicking" would appear to be a separate issue from the "cranking and cranking before spluttering into life"
The latter is as per DrScientists suspicions, ie fuel vapour lock most probably
The former sounds like something to do with the starter for sure.....
The following users liked this post:
Jagxjs (04-05-2013)
#4
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 24,916
Received 10,975 Likes
on
7,210 Posts
![Default](/forum/images/icons/icon1.gif)
Agreed on two different issues: A) a cranking problem and B) cranks, but hard to start problem.
As for the later, IMHO, vapor lock would seem unlikely after a "short trip" as menioned in the original post...unless perhaps the engine was running on the hot side and/or ambient conditions were extreme. And in theory (heh heh) the fuel temp switch (if functioning) would prevent thisby dumping vauum to the regulator and thereby increasing fuel pressure to clear the fuel rail.
I'm thinking more of an overfueling problem: a cold engine likes extra fuel (which would explain the easy starting when cold, as mentioned) but a warm engine certainly doesn't.
Drippy injectors? Excessive fuel pressure? Skewed coolant temp sensor? The temp sensor is easiest to check...or even replace for $20. As guesses go, that isn't too hateful.
Cheers
DD
As for the later, IMHO, vapor lock would seem unlikely after a "short trip" as menioned in the original post...unless perhaps the engine was running on the hot side and/or ambient conditions were extreme. And in theory (heh heh) the fuel temp switch (if functioning) would prevent thisby dumping vauum to the regulator and thereby increasing fuel pressure to clear the fuel rail.
I'm thinking more of an overfueling problem: a cold engine likes extra fuel (which would explain the easy starting when cold, as mentioned) but a warm engine certainly doesn't.
Drippy injectors? Excessive fuel pressure? Skewed coolant temp sensor? The temp sensor is easiest to check...or even replace for $20. As guesses go, that isn't too hateful.
Cheers
DD
The following users liked this post:
Jagxjs (04-05-2013)
#5
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 24,916
Received 10,975 Likes
on
7,210 Posts
![Default](/forum/images/icons/icon1.gif)
Assuming the clicking you hear is the starter itslef, and not just the starter relay, I'd agree that the starter is probably giving up.
Cheers
DD
The following users liked this post:
Jagxjs (04-05-2013)
#6
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)