92 ranger 1st gear issues
My 92 ranger has been giving me issues lately. I was able to work some out and now it idles nicely.
The issue I'm having is that when I put it in 1st gear or reverse the car pretty much stalls unless i keep the clutch pressed in about mid to 3/4 of way while feathering the gas. On other vehicles i've been able to move the vehicle with just clutch play. Once the vehicle is backed up and going into first is the same issue to where there's no power until you get to about 10mph. any help would be appreciated. |
4cyl should be idling at 750rpm, much lower and it will not have any power, will also vibrate alot, lol, 4cyl's only fire every 180deg of crank rotation
On cold start idle should be 1,000rpm, this is Choke Mode, rich fuel mix and high idle Does it do this? If not then ECT sensor could be the issue, it tells computer coolant temp so it will use Choke Mode on cold start Also IAC Valve is used by computer to set the higher idle when cold Fuel injection can't use an idle screw or choke plate because there are No "JETS", so computer has to run the Choke which all gasoline engines need on cold start |
I'll look into this and get back with you Ron!
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Originally Posted by RonD
(Post 2214178)
4cyl should be idling at 750rpm, much lower and it will not have any power, will also vibrate alot, lol, 4cyl's only fire every 180deg of crank rotation
On cold start idle should be 1,000rpm, this is Choke Mode, rich fuel mix and high idle Does it do this? If not then ECT sensor could be the issue, it tells computer coolant temp so it will use Choke Mode on cold start Also IAC Valve is used by computer to set the higher idle when cold Fuel injection can't use an idle screw or choke plate because there are No "JETS", so computer has to run the Choke which all gasoline engines need on cold start it's idling very bad with lots of vibration, i unplugged the IAC with the engine running and it did not change the idle. the vehicle should stall with the IAC disconnected correct? |
Yes, RPMs should drop below 600rpms when you unplug IAC Valve while engine is running, and engine can stall as well
On warmed up engine if RPMs do not drop then you most likely have a vacuum leak, which will also cause rough idle Leave IAC Valve unplugged, on running engine, and then disconnect one vacuum hose at a time on intake manifold, and plug the port with your finger Start with Power brake booster vacuum hose and then PCV valve hose, then move on to smaller hoses When RPMs drop or engine stalls you found the hose/device with the leak If IAC Valve was the issue your idle would be high but NOT rough, so its not an IAC Valve issue |
Originally Posted by RonD
(Post 2214421)
Yes, RPMs should drop below 600rpms when you unplug IAC Valve while engine is running, and engine can stall as well
On warmed up engine if RPMs do not drop then you most likely have a vacuum leak, which will also cause rough idle Leave IAC Valve unplugged, on running engine, and then disconnect one vacuum hose at a time on intake manifold, and plug the port with your finger Start with Power brake booster vacuum hose and then PCV valve hose, then move on to smaller hoses When RPMs drop or engine stalls you found the hose/device with the leak If IAC Valve was the issue your idle would be high but NOT rough, so its not an IAC Valve issue I did find the following hoses that were disconnected and couldn’t find a place for em I’ll buy a vacuum gauge tomorrow to check what the current vacuum is, is there a number I’m trying to stay between? https://cimg7.ibsrv.net/gimg/www.ran...665b68cc3.jpeg https://cimg1.ibsrv.net/gimg/www.ran...c07ae562f.jpeg https://cimg2.ibsrv.net/gimg/www.ran...b0c082fa0.jpeg |
At sea level to 1,000ft above sea level, gasoline engines should be 18" to 21" of vacuum, and steady at idle
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1 Attachment(s)
Originally Posted by RonD
(Post 2214639)
At sea level to 1,000ft above sea level, gasoline engines should be 18" to 21" of vacuum, and steady at idle
https://cimg3.ibsrv.net/gimg/www.ran...2f6710dcc.jpeg Needle jumps a bit, you can see how shaky the engine is in the background |
Looks like restricted air flow into the engine
Remove air filter and see what it shows, leave top off air cleaner box Could be the gauge if its new If possible test gauge on another engine, any engine should show 18 to 21" its an atmospheric thing not engine specific, 4cyl to V12 should have same vacuum range |
Originally Posted by RonD
(Post 2214691)
Looks like restricted air flow into the engine
Remove air filter and see what it shows, leave top off air cleaner box Could be the gauge if its new If possible test gauge on another engine, any engine should show 18 to 21" its an atmospheric thing not engine specific, 4cyl to V12 should have same vacuum range https://cimg3.ibsrv.net/gimg/www.ran...10b078a0e.jpeg https://cimg4.ibsrv.net/gimg/www.ran...e4736e2a7.jpeg so now it looks like it’s hovering in the 15 in Hg area. |
I won't trust the vacuum reading since it would seem both gauges are bad.
Regardless, I went ahead and did a compression test on a cold engine.
Also did a leakdown test.
I will be testing the DIS system next. |
Well the cylinder head was bad. Had recessed valves and the machine shop said the head was cracked. Looking at purchasing a reman head, do i have to stick with a 89-94 cylinder head or could I use one from 95-97s? @RonD
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