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1988 Chevy S10, possible flooding while parked?
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gmasem
New User
May 23, 2013, 5:38 AM
Post #1 of 4
(2757 views)
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1988 Chevy S10, possible flooding while parked?
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88 chevy S10 pickup, 4 cyl. With 120k miles
Looking for some ideas. Occasionally it will take forever to start - occasionally as in over the last 8 weeks it has given me trouble maybe 4 times. Turns over fine but won't fire and strong smell of gas. First time was after a 10 minute stop after a 40 minute drive. Other times it has been after it was parked for 8+ hours. It has been going on for a while, but I have only been driving it recently. When it does start it runs fine with one exception, at lower RPMs if you floor it it will spit and sputter till you let off the gas. Only at lower RPMs. Initial guess was an injector leaking down occasionally (TBI) and flooding it - but haven't had a chance to try anything because every time its done it I haven't had time or tools with me to do anything. Could dirty injectors cause both issues? At higher volumes it isn't atomizing properly (while at higher RPMs the airflow assists the atomization)? Thoughts or suggestions? Any more info you want just ask, have a long weekend coming up so can dig into it a little..
Thanks!!
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HT
User
May 23, 2013, 6:12 AM
Post #2 of 4
(2747 views)
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Re: 1988 Chevy S10, possible flooding while parked?
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All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 23, 2013, 6:53 AM
Post #3 of 4
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Re: 1988 Chevy S10, possible flooding while parked?
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gmasem : As HT just pointed out, those are the functions to run at all. In that says testing when this is NOT acting up will be fruitless.
Some things you could try that cost nothing as I do suspect it's dumping fuel that holds under pressure for a while or should after shut down OR rare to me for partial failure could be the coolant temp switch located near thermostat (I think has black and a yellow wire to it) tells it how much fuel to deliver.
If you only checked the plug to it those can be a problem spot especially if this is intermittent. If corroded try cleaning it and "dielectric" grease which is handy to have anyway on connections. New pigtail should be easily available or can come with a new one.
Check a couple easy spark plugs both to see if they look the same or evidence of constantly running rich,
T
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gmasem
New User
May 23, 2013, 6:32 PM
Post #4 of 4
(2694 views)
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Re: 1988 Chevy S10, possible flooding while parked?
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Thanks guys - hopefully one of the days this weekend will be decent and I will check it all over... Also hope to find out what has been done so I'm not redoing too much (not that there's much to this engine!). Does seem to be getting more frequent, half hoping it will do it at home when I have tools with me for once, it has always happened when I've been out so far
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