Question about 1999 Pontiac Grand Prix

1 Answer

I have a 1999 grand prix se. i had heads done doe to rocker arms walking out of the head. replaced push rods and lifters new gaskets all the way through. it idles real rough until you give it gas then it smooths out. i am pulling the code po300, multiple missfire. replaced the idle air control valve, set it per instructions, and helped out but still the same. checked fuel pressure @ 45psi and when u give it gas drops down to about 40-42 psi. made sure i was getting spark and i am. when you pull # 6 wire off it seems to stay the same so i swtched #6 with #4 plug and # 4 seems to do it now. (bad plug or plugs, idk). timing and idle are non adjustable so cant do anything there. it does have new plus and wires. i have checked and checked for vaccum leaks and cant seem to find any. my thought is down to bad plugs, dirty clogged injectors, and bad fuel pressure regulator. i am no mechanic but i am a big do it yourselfer. my wife is getting upset because i keep dumping money into my car instaed of taking her shoping or whatever. please i am begging for help before i get thrown in the dog house. thanks a million if you can help me out.

Posted by on

  • GetMeOttaHere Sep 11, 2010

    What engine size do you have? Was the engine acting like this before the engine repair?
    p0300 is a multiple cylinder misfire code.

  • jake stevens Sep 13, 2010

    i have the 3.1.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 2,926 Answers

What engine size do you have? Was the engine acting like this before the engine repair? p0300 is a multiple cylinder misfire code.

Posted on Sep 11, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

3400 v6 rods and lifters


Unless something was very worn, my first thought is the lifters had lost all oil pressure. The lifters are hydraulic and should maintain pressure to keep the rockers tight.

Jul 14, 2014 | 2002 Pontiac Grand Am

1 Answer

Push rod diagram


Exhaust push rods are longer
  • 6.0740 Inch Overall Length
  • Standard Size
  • Intake valves are
  • 5.7460 Inch Overall Length
  • Standard Size. Front head.
front head standing in front of car passenger to driver side
Ex , in ,in Ex ,in Ex

rear head standing in front of car passenger to driver side
Ex. ,In , Ex , In , In , Ex

remember exhaust push rods are longer
Rocker arm bolt ................................ 124 lb. in.plus 30 degrees

Apr 21, 2014 | 1999 Pontiac Grand Am GT

1 Answer

Bad rocker arm


could be lifter not charging of oil.it is not adjustable. or push rod out of lifter

Sep 20, 2013 | Pontiac Grand Prix Cars & Trucks

1 Answer

Adjust lifters


The push rods on the 3.1 engine are different lengths, so they may have mixed them up. The rocker arms are torqued to 85-90 INCH pounds, not foot pounds. You have to use an inch pound torque wrench.

Jun 25, 2013 | Pontiac Grand Prix Cars & Trucks

1 Answer

2001 grand cherokee 4.0l valve rocker torque specs


5 million made.
it's in the fsm book
posted here over 300 times.
are you asking , how to set rockers ?

chapter 9 page 27
------------------text fsm---------------------
INSPECTION
Inspect the pivot surface area of each rocker arm.
Replace any that are scuffed, pitted, cracked or
excessively worn.
Inspect the valve stem tip contact surface of each
rocker arm and replace any rocker arm that is deeply
pitted.
Inspect each push rod end for excessive wear and
replace as required. If any push rod is excessively
worn because of lack of oil, replace it and inspect the
corresponding hydraulic tappet for excessive wear.
Inspect the push rods for straightness by rolling
them on a flat surface or by shining a light between
the push rod and the flat surface.
A wear pattern along the length of the push rod is
not normal. Inspect the engine cylinder head for
obstruction if this condition exists.
INSTALLATION
NOTE: This procedure can be done with the engine
in or out of the vehicle.
(1) Lubricate the ball ends of the push rods with
Mopart Engine Oil Supplement, or equivalent and
install push rods in their original locations. Ensure
that the bottom end of each push rod is centered in
the tappet plunger cap seat.
(2) Using Mopart Engine Oil Supplement, or
equivalent, lubricate the area of the rocker arm that
the pivot contacts. Install rocker arms, pivots and
bridge above each cylinder in their originally position
(Fig. 23).
(3) Loosely install the capscrews through each
bridge.
(4) At each bridge, tighten the capscrews alternately,
one turn at a time, to avoid damaging the
bridge. Tighten the capscrews to 28 N·m (21 ft. lbs.)
torque.
(5) Install the engine cylinder head cover (Refer to
9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - INSTALLATION).

Mar 13, 2011 | Jeep Grand Cherokee Cars & Trucks

3 Answers

I have a loud ticking under my valve cover. 97 ford escort. I think its a loose valve but is it some thing i can fix. I know a little about cars. but not an expert


not a valve, but a lifter. I will paste procedure below. You judge if you can do it or not. Recommend you replace them all while you're in there. If you let this go, the lifter will wear out the camshaft. Lifters are $22 each, and you have 8 of them. You will also need a new valve cover gasket.
Please let me know if you have questions, and thanks for using FixYa.

2.0L Engine
SOHC engine
See Figures 6, 7, 8 and 9
  1. Disconnect the engine air cleaner-to-valve cover hose from the cover by compressing the hose clamp with pliers and sliding the clamp back, then separate the hose from the cover.
  2. Remove the spark plug wire separators from the valve cover and set the wire assemblies aside.
  3. Unfasten the three valve cover retaining bolts.
  4. Remove the valve cover and gasket from the cylinder head.
WARNING Do not use any abrasive grinding discs to remove gasket material. Use a plastic manual gasket scraper to remove the gasket residue. Be careful not to scratch or gouge the aluminum sealing surfaces when cleaning them.
  1. Remove the old gasket material from the cylinder head and valve cover mating surfaces.

jturcotte_163.jpg

Fig. Fig. 6: Remove the spark plug wire separators from the valve cover

jturcotte_164.jpg

Fig. Fig. 7: Compress the engine air cleaner-to-valve cover hose clamp with pliers, and slide the clamp back ...


jturcotte_165.jpg

Fig. Fig. 8: ... then disconnect the hose from the valve cover


jturcotte_166.jpg

Fig. Fig. 9: Unfasten the valve cover retainers and remove the valve cover-2.0L SOHC engine


If removing more than one valve lifter (tappet), mark the lifters and their locations as they must be installed in their original bores.

  1. Remove the rocker arm(s).
  2. Unfasten the lifter guide plate retainer.
  3. Remove the guide plate and the lifter.


To install:
  1. The oil feed hole in the lifter must face away from the oil feed hole in the cylinder head.
  2. Lubricate the lifter(s) with clean 5W-30 engine oil and install them in their original bores.

Make sure the lifter guide plate retainer tabs are towards the rear of the cylinder head, and the lifter guide plate tabs are towards the front of the cylinder head.
  1. Install the lifter guide plate and tighten the retainer.
  2. Install the rocker arms.
Do not use any sealer with a silicone type gasket.
  1. Install a new gasket and the valve cover.
  2. Install and tighten the valve cover retainers to 71-97 inch lbs. (8-11.5 Nm).
  3. Attach the spark plug wire separators to the cylinder head.
  4. Connect the engine air cleaner-to-valve cover hose and engage the hose clamp

Jan 19, 2011 | Ford Escort Cars & Trucks

3 Answers

I have a 1999 grand prix se. it idles rough as heck but smooths out with gas. i am throwing code PO300 (multiple misfire) but cant figure out why. i have checked all hoses and electrical conectors and all...


Check engine compression--all cylinders. Rockers may have been overtightened eliminating valve lash on some cylinders. I've done it myself at times. If compression isn't right, pull valve covers and see if you can twist each pushrod in your fingers when lifter is off the cam lobe. If not, reaccomplish rocker tightening procedure carefully.

Sep 09, 2010 | 1999 Pontiac Grand Prix

2 Answers

Average cost to replace lifters on a 2002 jeep grand cherokee 4.0


depending all that is done about $300 dollars thats 12 lifters test 12 push rods replase rods $4.00 each rocker arm cover gasket oil filter and oil change afterwords. This does not include any replacement of oil pump or flushing which may be required, also would recommend a top engine clean before doing lifter replacement so when you change the oil once.

Nov 16, 2009 | 2002 Jeep Grand Cherokee

1 Answer

Oil not getting to back rocker, push rod clear. had a new head gasket put on, pulled head to see if it was put on backwards, it was not. how do you replace lifter.


Since you already have had it apart, you know at what point you can see the lifter. Lifter pulls straight up out of its bore, new one drops right in. If cam contact surface is worn concave, you need to replace cam as well. Always use assembly lube on lifter/cam contact surface when installing.

Apr 23, 2009 | 1990 Chevrolet S 10 4WD

1 Answer

Push Rods


No, it's fairly easy, just remove the valve cover, unbolt the rocker arms, remove pushrods. Make sure you have correct parts and compare length of new ones to old ones. Too long of a pushrod and you could have major damage. Slide pushrods into lifters, you can look down through the head and see the lifter. You can also feel when the rod is in the lifter correctly. Install rockers in reverse trying to put back in exact location. I recommend torqing these, you'll have to find the spec. You could spin the engine with coil unhooked so it won't fire before you put the valvecover back on to make sure they're all moving the same. Install valve cover, etc, your done.

Oct 18, 2008 | 1995 Jeep Grand Cherokee

Not finding what you are looking for?
1999 Pontiac Grand Prix Logo

133 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

75117 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7772 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...