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Timing issues?

Tiny
WUTSUPY
  • MEMBER
  • 1990 PONTIAC SUNBIRD
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
I got a new injector, I have gas, spark, compression, timming (i think) and when I turn it over it does not try to start, the engine rotates but it does not fire (at all, noteven a little bit) I tried the old trick with jb-80 down the cylenders to replace compression but that did not work, as I said everything is there but it dont run. I thought it was OVERLY flooded so I changed the oil (smelled HEAVLY of gas) and pulled the plugs, put the flame to them and put lighter in cylender, I put them back in and still got nothing. What could it possibly be now?

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Friday, December 3rd, 2010 AT 3:40 AM

15 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,772 POSTS
Are you getting a good hot blue snapping spark? What is the compression? Have you checked the fuel pressure to make sure the regulator isn't allowing too much fuel pressure or not enough?

As far as timing, have you checked to make sure the #1 cylender is TDC when the crank is at TDC?
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Friday, December 3rd, 2010 AT 3:43 AM
Tiny
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Check for spark and fuel pressure first. If no spark on the DIY part on the site it should have your ignition system there andhow to check it out.
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Friday, December 3rd, 2010 AT 3:44 AM
Tiny
WUTSUPY
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  • 59 POSTS
I have a good blue spark and I will check compression tomaro. The fuel pressure is good, and even if it was not good it would still try to start. The injector is spraying gas in a fine mist. I did try spraying ether in to the TBI and it still did not pop off.
As for the timing can I have details on how to check it?
Thank you for your time.
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Friday, December 3rd, 2010 AT 3:51 AM
Tiny
HMAC300
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Well if you check your compression and it is low all the way accross then your chain/gear is probably out of whack. If you bring this up to #1 then your cap if you have one should point to #1 on the cap. If it doesn't then your timing chain/gear is broke or slipped. I'm taking it that this is a 2.0 and still has a cap on it.
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Friday, December 3rd, 2010 AT 3:57 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Let me know what you find.

Joe
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Friday, December 3rd, 2010 AT 4:55 AM
Tiny
WUTSUPY
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  • 59 POSTS
Ok the problems started 2 years ago; one day it just stopped running so we replaced the whole fuel system and it turned out to be the ignition module. But before we got it injecting fuel we poured gas down they tb and it ran but just dint stay running so apparently the timming was right a month ago but it threw it self off some how by us continualy turrnung it over. And ill look at the car later today
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Friday, December 3rd, 2010 AT 1:16 PM
Tiny
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  • 59 POSTS
I just checked compression, its good I did the finger test. It is good across all 4.
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Friday, December 3rd, 2010 AT 3:35 PM
Tiny
HMAC300
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A finger test can't tell between 85 or 150 psi.
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Friday, December 3rd, 2010 AT 3:41 PM
Tiny
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Ha your proboly right. Ill do loan a tool program and get one.
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Friday, December 3rd, 2010 AT 3:53 PM
Tiny
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When I replaced the ignition controle module I opened the distributor cap, could that have affected it?
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Sunday, December 5th, 2010 AT 3:29 AM
Tiny
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Removing the distributor cap shouldn't hurt anything unless you loostened the ignition wires or the cap wasn't properly replaced. I will assume you replaced the rotor.
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Monday, December 6th, 2010 AT 5:54 AM
Tiny
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No I dint replace the rotor. Today I changed plugs, sprayed oil in cylenders, and just looked over the engine as a whole. I pulled on the trottle and I looked down in to the Throttle Body, there is a large pool of gas in the botton of the Throttle body. So the car is not getting gas to the cylenders, right?
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Monday, December 6th, 2010 AT 6:57 PM
Tiny
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Have you checked the timing belt? Also, why did you spray oil into the cylenders?
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Tuesday, December 7th, 2010 AT 3:51 PM
Tiny
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Yes the timming is fine. I took the cam covor off and they are all spinning like normal. And I was told that if you spray oil in down the spark plug holes it well replace compression.
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Tuesday, December 7th, 2010 AT 7:03 PM
Tiny
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That is called a wet compression test. It is a way to check if the rings are bad. As far as the timing, did you make sure the timing marks all aligned? As far as the pool of fuel, it has me lost. If you have good compression, it should be drawing the fuel into the engine. What were the compression readings?
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Wednesday, December 8th, 2010 AT 1:39 PM

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