Ill just get a gauge and test. And just replace that does the iac have a gasket are something haven't replaced it on my truck since I've had it. So I'm kind new about how the engine runs and what senders do what. Thank appreciate ur help.

__________________
88 ford ranger stx highrider 4x4 2.9 on 31s 3.73 ratio

It is the tube looking cylinder on the passenger side of your upper intake, two small bolts and one electrical connector
The new one will come with the gasket
A very (VERY) small amount of gasket maker to hold it in place and help with the seal
Not so much that it squeezes out when you tighten it down

__________________
1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year

I ought to be good, spent 20 years working on helicopters
This Ranger is my 12th project car
Started with a 68 firebird, still kicking myself for selling that one
Everything before this one was carborated and a Chevy
This is the first time I have touched a fuel injected motor
Probably the last too, my latest project is a 51 Willys jeep with a carborated 289

__________________
1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year

Still have not gotten an answer to my original question
What controls the air/fuel mixture on a 1988 2.9 motor with the MAP sensor controls

__________________
1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year

Might be wise to check the coolant temp sensor for the for the ECM...not the one for the gauge cluster, it has nothing to do with one feeding info the ECM. If it the coolant sensor for the ECM, is under reading temperature or not working, the the ECM continues in HIGH fuel delivery.

__________________
2011 Ranger XLT 2x4,4.0 SOHC, 5 Speed Auto, 3.55 Rear. Oxford White.

Simplicity is the ultimate sophistication.

Torque it down till it breaks off, then back it off 1/4 turn.

Ok, talked to a retired Ford tech friend of mine and he said there should be an Orange wire from the wire harness near the distributor that gets grounded to the rear of the engine on the passenger side. If you lose ground on that wire, the engine will run very rich.

__________________
2011 Ranger XLT 2x4,4.0 SOHC, 5 Speed Auto, 3.55 Rear. Oxford White.

Simplicity is the ultimate sophistication.

Torque it down till it breaks off, then back it off 1/4 turn.

I actually have a temp sensor for the ECM side, I will install that and I will triple check the ground (I know it is good, but I will check anyway)
Due to other issues I have replaced every sensor except the temp one

----------

By-the-way if the temp sensor for the ECM was bad wouldn't it show a code?

__________________
1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year

OK replaced the ECU temp sensor, replaced the O2 sensor while I was at it.

Triple checked the orange ground wire by the distributor

Checked for vacuum leaks

Now we will see if the unburned gas smell goes away and the gas mileage improves

__________________
1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year

Good luck !!!

__________________
2011 Ranger XLT 2x4,4.0 SOHC, 5 Speed Auto, 3.55 Rear. Oxford White.

Simplicity is the ultimate sophistication.

Torque it down till it breaks off, then back it off 1/4 turn.

Change O2sensor at exhaust and make sure your alternator is running at 14.4... That fixed mine

__________________

Armenta, David A.
/Orig. 2.9L /Rebuilt Trans on 1 Oct 2012 /K&n Filter /10SI 3wire Altrntr /3'' lift kit

New alternator it reads 14.74.
Smells better, seems like less unburnt fuel, don't know if the MPG is any better yet

----------

OOOPS make that 14.47

__________________
1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year

Ok finally checked the gas mileage -no change - still at 11.5 mpg
Smell of raw fuel is gone though

__________________
1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year

What is the average gallon gas take for my 88 stx ranger I'm trying to do my MPG

__________________
88 ford ranger stx highrider 4x4 2.9 on 31s 3.73 ratio

I think you are asking what is the formula for mpg

Take the number of miles you drove, divide it by the number of gallons of gas you used to go that far

ie: I drove 142 miles, I used 12 gallons of gas

So 142 divided by 12 = 11.8 mpg

__________________
1988 Ranger STX, custom built flatbed, winch, 33x 10.5 BFG mudders
1974 Suburban (AKA "the sub") lockers front & rear, 383 cu in not even close to stock motor, snowplow 37 x 12.5 HUMMV tires, 4.56 gears
1952 M38 (CJ3) Jeep - my newest project - 289 ford, hardtop, got it with not one wire in it. Hope to have it driving this year

Ima asking the size of the tank sorry lol I'm wondering what size it is BC of my gas gauge isn't wrking rite thanks

__________________
88 ford ranger stx highrider 4x4 2.9 on 31s 3.73 ratio