Hard starting, low hunting idle, until it warms up? |
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Hard starting, low hunting idle, until it warms up? |
Geezer914 |
May 27 2017, 09:30 AM
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#1
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Geezer914 Group: Members Posts: 1,460 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States |
1975 1.8L Ljet injection. Car is hard to start. It takes 3-4 tries and some time a shot of starting fluid. Fuel pressure gauge reads 30 lbs. in engine compartment. The rpm rises to 1800 rpm for about 15 seconds, then the idle hunts between 500 rpm and almost stalling out. After the engine warms up it runs and starts as normal. Vacuum hoses are tight. Comments? (IMG:style_emoticons/default/confused24.gif)
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Rob-O |
May 27 2017, 12:31 PM
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#2
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Senior Member Group: Members Posts: 1,252 Joined: 5-December 03 From: Mansfield, TX Member No.: 1,419 Region Association: Southwest Region |
So much to test for, but in my opinion (and I just reinstalled L-jet recently and have gone through every conceivable issue) there are two pieces of equipment that I think are essential to diagnosing L-jet issues. A smoke generator (make your own after watching some YouTube vids) and an AFR ($100-$200). Of course a voltmeter, too.
Read up on Malcolm's posts about his recent issues. Has it always run like this or is this a recent issue? While hoses may be tight they could be split somewhere. The smoke generator will tell you if and where you have a vacuum leak. The AFR will tell you if you're running lean or rich. Assuming that it ran well before and this is recent and no vacuum leaks, I'd check the CHT first. Just check to make sure it's plugged in. Hard to see if it is the original wire harness because the connector has a sheath. When the engine is cold the CHT plays a huge role in the mixture. If it isn't connected or crapped out it won't richer the mixture. That leads to lean/low idle. The CHT when warm doesn't have as much effect. The AFR will help you in the event everything is working as advertised but the AFM needs to be adjusted. |
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