Actin weird?
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Actin weird? - 3/13/2007 8:27:01 PM
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Chevyguy032
Posts: 170
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well i got my new distributor cap and rotor the other day (accel) and today when i went to change them everything went on well...except the rotor was real hard to get on all the way(dont know if that is normal or not) well after that i went to fire it up and it ran real ****ty like it was starving for fuel for about 5 seconds than it ran nice, but the service engine light was one..so i decided to swap back to the stock cap and rotor and its doing the same thing...it dosent really backfire..so i am confused on what could of caused this?
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1987 K5 Blazer
Motor: 350 TBI
Trans: 4 Speed Manual 4wd
Stance: 32x 11.5x15(stock)
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RE: Actin weird? - 3/13/2007 11:40:58 PM
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Hanr3
Wheels & Tire Moderator
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Spark plugs out of order.
Get them back in the correct firing order.
1-6-5-4-3-2 around the cap. #1 is the closest to the #1 piston typically.
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"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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RE: Actin weird? - 3/13/2007 11:59:40 PM
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20Blazer00
Posts: 862
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quote:
ORIGINAL: Hanr3
Spark plugs out of order.
Get them back in the correct firing order.
1-6-5-4-3-2 around the cap. #1 is the closest to the #1 piston typically.
Its an 87 with a 350 TBI, at least that is what the signature says...you will have to find the firing order, it might be on the intake near the distributor, if the intake is aftermarket then you can look it up in a Haynes/Chilton's manual. Then use the 0* timing mark on the crank to find the number 1 cyl then mark the cap and place the wires back on the cap as needed in rotational order...
< Message edited by 20Blazer00 -- 3/14/2007 12:02:48 AM >
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Mark
2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: Actin weird? - 3/14/2007 12:08:52 AM
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Hanr3
Wheels & Tire Moderator
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I guess I should read the signature huh?
Doh!!!!
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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RE: Actin weird? - 3/14/2007 1:46:45 PM
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Chevyguy032
Posts: 170
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yea i did that a good 5 times..lol but i also notcied some blue smokes puffs out when it first starts up....and as it warms it if you get hard in it, it misses I am hopefuly scanning it tomorrow hopefuly in my shop class..ill let you know what the code is..thankz
< Message edited by Chevyguy032 -- 3/14/2007 1:47:13 PM >
_____________________________
1987 K5 Blazer
Motor: 350 TBI
Trans: 4 Speed Manual 4wd
Stance: 32x 11.5x15(stock)
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RE: Actin weird? - 3/14/2007 2:30:27 PM
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fnirish
Posts: 56
Joined: 8/21/2006
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If I'm not mistaken, the rotor is keyed, so it only goes on one way. I don't remember having any trouble putting the one on my 89.
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1999 Blazer 4DR 2WD
1989 V10 Blazer 4X4
1989 Iroc Z28 Convertible
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RE: Actin weird? - 3/14/2007 3:03:22 PM
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20Blazer00
Posts: 862
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quote:
ORIGINAL: Chevyguy032
yea i did that a good 5 times..lol but i also notcied some blue smokes puffs out when it first starts up....and as it warms it if you get hard in it, it misses I am hopefuly scanning it tomorrow hopefuly in my shop class..ill let you know what the code is..thankz
Those puffs in the morning maybe caused by worn valve guides and seals.
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Mark
2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: Actin weird? - 3/14/2007 3:07:38 PM
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20Blazer00
Posts: 862
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quote:
ORIGINAL: fnirish
If I'm not mistaken, the rotor is keyed, so it only goes on one way. I don't remember having any trouble putting the one on my 89.
Most of the older design caps don't have numbers on the top telling you what wire goes to what cylinder and it is common when replacing wires that if you removed all the wires at once to get them misplaced on the top of the cap when re-installing the new wires...luckily GM cast the firing order into the body of the manifold near the rear so that you could see it and make it easier to replace wires, only problem aftermarket caps don't come with the same information embeded into them...
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Mark
2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: Actin weird? - 3/14/2007 10:35:00 PM
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Chevyguy032
Posts: 170
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yea but i put the stock rotor and cap on and it still does it and the ouff just started happening when the motor started acting funny..i also smell fuel while driving when i have the windows down
< Message edited by Chevyguy032 -- 3/14/2007 10:38:39 PM >
_____________________________
1987 K5 Blazer
Motor: 350 TBI
Trans: 4 Speed Manual 4wd
Stance: 32x 11.5x15(stock)
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RE: Actin weird? - 3/19/2007 10:58:48 PM
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Chevyguy032
Posts: 170
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well i got it scanned today and 2 codes came up one about the MAP sensor..and the other one sayin my exhaust is rich..now would the MAP sensor cause my exhaust to become rich?
_____________________________
1987 K5 Blazer
Motor: 350 TBI
Trans: 4 Speed Manual 4wd
Stance: 32x 11.5x15(stock)
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RE: Actin weird? - 3/19/2007 11:24:25 PM
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20Blazer00
Posts: 862
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It is possible...since the computer uses the information from the MAP sensor to determine the amount of air flowing into the intake. It uses the vacuum created in the intake to calculate what the fuel ratio should be...
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Mark
2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: Actin weird? - 3/20/2007 1:48:22 AM
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supramacist
Posts: 13
Joined: 3/19/2007
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Carberators used to be much easier to work than this fuel injected crapolla but I still like it.
I have decided that todays autos get better gas mileage but are more difficult to work on.
The old school stuff is easier to work on but costs more at the pumps more frequently.
In another 10 years wer'e all going to be road warrioring for gas because everything is going to be
hydrogen or electric.
What the heck am I supposed to do with my porsche and my supra, our blazer and our benz.
I want to buy the old lady a new titan but dang.
< Message edited by supramacist -- 3/20/2007 1:49:25 AM >
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RE: Actin weird? - 3/20/2007 1:55:02 AM
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SDimeBlazerlady
Posts: 484
Joined: 9/9/2006
From: Everett,Wa
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Have your Cat converter checked also..If u have 1 
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RE: Actin weird? - 3/20/2007 7:29:31 AM
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swartlkk
Posts: 14473
Joined: 5/1/2005
From: Waterloo, NY
Status: online
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Yeah, the MAP sensor is used in conjunction with the TPS (throttle position sensor) and the O2 sensor to determine the proper IPW (injector pulse width). It is quite possible that the MAP sensor is causing the whole problem.
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Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: Actin weird? - 3/27/2007 2:27:47 PM
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Chevyguy032
Posts: 170
Joined: 10/21/2006
Status: offline
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well i changed the MAP sensor today and it still acts like it wants to stall out..i dont know what to do at this point..
_____________________________
1987 K5 Blazer
Motor: 350 TBI
Trans: 4 Speed Manual 4wd
Stance: 32x 11.5x15(stock)
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RE: Actin weird? - 3/27/2007 11:52:40 PM
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SDimeBlazerlady
Posts: 484
Joined: 9/9/2006
From: Everett,Wa
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Could the distributor itself be bad?
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RE: Actin weird? - 3/28/2007 2:06:35 AM
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MNHawk
Posts: 451
Joined: 10/20/2006
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Check the injector spray, if its like a fine mist shower on both injectors (if its duel) then that is fine. If you see droplets like rain then you have a dirty injector. If its lacking spray then you might have faulty wires to the injector. (the older TB's are known for dead wires).
Now with a RICH GAS code for exhaust, that would lean me towards a *Fuel Pressure Regulator* or the TPS going out. With the newer side mount air cleaners like on the 3.1, 3.3, 3.8, 4.3, 5.7's it was easy to find out if that was it due to there would be gas all the way out to the filter.
Sad part is that the MAP sensor could had just been a bad vacuum line. Usually these last a lot longer then most think on the older stuff. This would also explane excessive fuel use, due to when the vacuum line is bad, the computer will dump extra fuel in the motor. Like going from 24 mpg down to 11 mpg.
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74 W200 4x4 360/727/NP205 D44/D60
1981 C-20 Suburban Full Size 4x4 350 4sp manual (newest toy)
91 Honda Accord (daily Driver)
1979 Ford LGT 125
2005 JD L130
95 Blazer 4 door 4x4 4.3 lt vin W(parked selling or parting out)
93 S10 Blazer 4dr 4.
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RE: Actin weird? - 3/28/2007 11:01:57 PM
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Chevyguy032
Posts: 170
Joined: 10/21/2006
Status: offline
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yea there is a vaccum line that comes from the MAP sensor that i have no idea where it goes to
_____________________________
1987 K5 Blazer
Motor: 350 TBI
Trans: 4 Speed Manual 4wd
Stance: 32x 11.5x15(stock)
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