Question about Dodge W150

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1988 w150 318cid 2bbl TBI - bogs under heavy throttle "off the line" then revs normally after moving about 10-20 feet. Engine revs normally when in park. All sensors but the MAP have been replaced, including the fuel regulator, filter and injectors. This increased the fuel mileage, but not the hesitation (bogging) when taking off from a a dead stop. If the vehicle is slightly rolling or facing downhill, the bogging doesn't occur. Any ideas?

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Sounds vacuum related

EGR Valve or vacuum leak

TPS Sensor ?

Posted on May 23, 2011


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No power

which engine? 8valve TBI or 16v MPI?
apples and oranges diffr.
no power when.?
car wont move?
car hesitates?
or bog on hills?
or? only at tip-in throttle , if I wait, bit , power comes on strong.

does W.O.T work up hill, flogging the dog>?
yes/no? this is key to cause,

wot means wide open throttle or pedal to dah metal.
this page cover bog, there is misfire page too,

Mar 26, 2014 | 1994 Geo Tracker

1 Answer

Does a 1988 carborated Nissan pathfinder have a fuel pump regulator?

Are you sure it is a carburetor and not throttle body injection? They do look similar.
If it is a carburetor, there would not be a regulator. The fuel pump will either be a mechanical pump mounted on the engine, or a low volume electric pump in the gas line from gas tank to the engine.
If it is throttle body injection (TBI), yes, there is a fuel pressure regulator, probably located near the throttle body. It will have gas lines connected to it (one line will be a return line back to the gas tank) and a vacuum line. The fuel pressure on TBI systems is not as high as multi point injection, usually around 20 psi. You would have to check the specific pressure requirement for your pathfinder.

Take off the air cleaner cover and look at top of unit. A carburetor should have a choke plate right at top of the carb throat. However some Nissans by '88 had a carburetor without a choke-it used an enricher jet controlled by the ecu for added fuel when starting.. On a TBI, looking down at the unit where the air goes in, you will see one or two injectors with a wiring harness connected to them-each injector will have two wires connected to it.
If still unsure, check engine designation on the under hood label. Carbureted engines will have a s letter designation, injected engines will have letter i. To explain: my '87 Sentra is carbureted, so engine designation is E16s, some same engines were injected, so their designation is E16i.

Sep 29, 2013 | Cars & Trucks

1 Answer

1988 ford f150 302: heavy hesitation.

Check engine light? Have you checked fuel pressure?

Apr 06, 2010 | 1988 Ford F 150

1 Answer

Were is the fuel filter on a 1988 cady eldorado

1988 Cadillac Eldorado 4.5L TBI 8cyl the Fuel Filter is located under vehicle, driver side, below engine area, rear of wheelwell, mounted in fuel line.

Hope this helped. TY for using Fixya (remember comment and rated this).

Apr 01, 2010 | 1988 Cadillac Eldorado

1 Answer

Engine wont idle on my vitara jlx 1993

Check your air idle control valve, check for the wires to be fretted or broke, and also check the vacuum lines to it. 
The air idle control valve mey be dirty and a good cleaning with throttle body clean through the throttle body may help clean the carbon build up. 
If there is a Auto Zone, have the Vitara scanned for a DTC code. 
Here is a few things you can do. 
Checking  the IAC (it's called the ISC on Single Point TBI)
It is screwed to the throttle body, and has a 2 pin electrical connector) with an Ohmmeter - the solenoid should be 11 to 14 ohm.  If not, replace.  

To test the IAC / ISC
Use a Duty Meter, and adjust the air adjust screw to get 50%.  If the revs are not right at that point, adjust some more to try to get them correct, but if the duty goes below 28%, a vacuum leak is highly likely.

Air Adjust screw for TBI / Single point   look on the Throttle Body, just below the fuel line and maybe an inch to the left of the Fuel Pressure Regulator - it looks like a cross head screw into the TB.

The 8v (Single Point / TBI) uses a throttle opener device to open the throttle extra during starting.  When the engine starts to run, a vacuum line is applied to the device through a vacuum servo valve, controlled by the ECM. The vacuum closes the throttle opener, to bring the revs down to normal.  The ECM will operate the VSV after about 10 sec from engine start (less if the coolant is warm).

Try these things for now and keep me posted. good luck.

Jun 01, 2009 | 1999 Suzuki Vitara

1 Answer

Low idle on my 1992 gmc pickup with 4.3 v6

On the bottom right side of the throttle body toward the firewall, is the Idle air control valve. Sometimes this gets carbon build up that interferes with the stepper motor. You can unplug it and remove the valve (it unscrews with a 27mm or 25mm wrench; or the medium crescent will work). Once you have it out use a mirror to look into the bore it came out of. If it is plugged or heavy with carbon you can clean it with healthy dose of throttle body cleaner... If it is really bad you can use a bore brush to loosen up the heavy stuff and flush with generous amounts of throttle cleaner.

Check all your vacuum lines since your there. replace the old brittle stuff. Check and make sure the TBI unit is snug and not loose, look for signs of bad gasket material around the base.

Spray the TBI throat and clean the butterfly. You can use a old toothbrush to loosen up the build up and prevent you from using a whole can of cleaner.

Went you have everything reassembled, be aware that it may stumble a little on start up. It has to burn off all that throttle body cleaner.

After is it idling, you can clean the TBI throat by spraying the cleaner down into the throttle while manipulating the throttle to keep the engine running. (do not over rev the engine)

If the condition continues, there is a procedure to check the IAC. It is fairly cheap at most discount part stores. ($35 to $45)

May 28, 2009 | 1992 GMC Sierra

1 Answer

Have an 88 Chevy c1500 305 Eng i want to change tbi to carburetor

2bbl intake will not fit 87-95 small blocks heads are diferent from pre 86.the center bolts on your manifold are angled different than the front and back bolts.your 2bbl manifold has the same angle bolts front to back.i converted my buddies 89 to carb,had to make adapter plate for carb.but to make a long story short there is a lot of power loss and fuel economy your better of with tbi.

Mar 26, 2009 | 1988 Chevrolet C1500

1 Answer

1991 c1500 305- engine idles at 1900 rpms. was put on modis for diagnosis, stalls at normal idle 800rpm. was told to replace throttle body and route egr to a port vaccum. what do you suggest. no other...

there are numerous things that could cause this. Something I do on mine every 6000 miles is get a can of carb & coke cleaner. I start the truck, and rev to 3000 rpms then I spary cleaner directly in to the TBI. This cleans pretty much everything out that has been built up over time. (Truck will try to die when performing cleaning. Keep sparying and up the amount of throttle just enough to keep running.) Now since the truck is a few years old I would next CK the vacum lines. They run all over the top of the engine as most people know but also on your truck they are what run the air vents moving from floor to vent to defrost, and if 4x4 the front axel hub locks. There is a vacum line that runs from TBI to the vacum canister (located on driver side behind head light) Then it runs down beside the radiator to the frame rail then down the frame rail to the cab. This line is mostly metal (just like the metal brake lines) and it seems get holes in it from it rubbing all sorts of ****. Then I would ck the throttle postioning senser, and timing. Also on these trucks the idle will be around 200 to 400 rpms higher in Park or Netural then if in Reverse or Drive. If it does not change more then likely you are having either problems with a sensor in the transmission, or Computer problems. Also if you have a TBI spacer it will rasie your idle most the time. If you dont have a spacer you will also want to try this. (you never know if someone else may of adjusted it) You will need to adjust your idle screw. NOTE: Keep track of exactly how much in or out you adjust this screw. This way it can always be returned to stock.)

Aug 05, 2008 | 1991 Chevrolet C1500

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